Jeronique Cunningham v. Tim Shoop ( 2022 )


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    Pursuant to Sixth Circuit I.O.P. 32.1(b)
    File Name: 22a0004p.06
    UNITED STATES COURT OF APPEALS
    FOR THE SIXTH CIRCUIT
    ┐
    JERONIQUE D. CUNNINGHAM,
    │
    Petitioner-Appellant,       │
    >        Nos. 11-3005/20-3429
    │
    v.                                                  │
    │
    TIM SHOOP, Warden,                                        │
    Respondent-Appellee.         │
    ┘
    Appeal from the United States District Court
    for the Northern District of Ohio at Toledo.
    No. 3:06-cv-00167—Patricia A. Gaughan, District Judge.
    Argued: May 12, 2021
    Decided and Filed: January 10, 2022
    Before: MOORE, KETHLEDGE, and WHITE, Circuit Judges.
    _________________
    COUNSEL
    ARGUED: Michael J. Benza, LAW OFFICE OF MICHAEL J. BENZA, Chagrin Falls, Ohio,
    for Appellant. Margaret Moore, OFFICE OF THE OHIO ATTORNEY GENERAL, Columbus,
    Ohio, for Appellee. ON BRIEF: Michael J. Benza, LAW OFFICE OF MICHAEL J. BENZA,
    Chagrin Falls, Ohio, Karl Schwartz, WISEMAN & SCHWARTZ, LLP, Philadelphia,
    Pennsylvania, for Appellant. Margaret Moore, Stephen E. Maher, OFFICE OF THE OHIO
    ATTORNEY GENERAL, Columbus, Ohio, for Appellee.
    MOORE, J., delivered the opinion of the court in which WHITE, J., joined.
    KETHLEDGE, J. (pp. 51–62), delivered a separate opinion concurring in the judgment in part
    and dissenting in part.
    Nos. 11-3005/20-3429                  Cunningham v. Shoop                                  Page 2
    _________________
    OPINION
    _________________
    KAREN NELSON MOORE, Circuit Judge. Jeronique Cunningham and his half-brother
    Cleveland Jackson robbed and shot several friends and their family members. A three-year-old
    girl, Jala Grant, and a seventeen-year-old woman, Leneshia Williams, were killed; six others
    were injured.    Cunningham was indicted and tried on two aggravated-murder counts, an
    aggravated-robbery count, and six attempted-aggravated-murder counts. The aggravated-murder
    charges carried death-penalty and firearms specifications. Cunningham and Jackson were tried
    separately. The jury found Cunningham guilty on all counts and specifications and sentenced
    him to death. See State v. Cunningham (Cunningham II), 
    824 N.E.2d 504
    , 510–13 (Ohio 2004).
    We consider eight issues in this habeas case. The first and second issues are juror-bias
    claims involving Cunningham’s jury foreperson Nichole Mikesell. Cunningham argues that
    Mikesell’s colleagues at the county’s children-services agency improperly relayed external
    information about Cunningham to her. He also argues that Mikesell’s relationship with the
    victims’ families affected the jury’s impartiality. He seeks a hearing to investigate jury bias on
    both fronts. Third, we consider whether Cunningham’s counsel ineffectively failed to investigate
    and present mitigating evidence.      Fourth, we review whether Cunningham’s trial counsel
    ineffectively failed to investigate, obtain, and present expert testimony about ballistics. Fifth, we
    evaluate whether the trial court improperly restricted Cunningham’s ability to question
    prospective jurors during voir dire. Sixth, we decide whether the trial court failed to instruct the
    jury that it must determine Cunningham’s personal culpability before imposing a death sentence.
    Seventh, we determine whether the prosecution improperly failed to turn over witness statements
    to the defense. Finally, we consider whether the prosecution made improper closing arguments
    during the guilt and sentencing phases. CA6 No. 11-
    3005 R. 50
     (7/27/11 Order at 2); R. 71
    (10/13/11 Order at 1); R. 187 (7/28/20 Order at 3).
    Nos. 11-3005/20-3429                Cunningham v. Shoop                                Page 3
    We cannot grant Cunningham relief for issues three through eight. But we conclude that
    Cunningham is entitled to proceed on his juror-bias claims. We therefore REVERSE and
    REMAND so that the district court can conduct an evidentiary hearing to investigate juror bias.
    I. ISSUES #1 & #2: JUROR BIAS
    A. Background
    1. Trial
    Nichole Mikesell served as the jury foreperson for Cunningham’s trial. R. 194-2 (Trial
    Tr. at 1498) (Page ID #10708). On her jury questionnaire, Mikesell indicated that she worked as
    a child-abuse investigator at Allen County Children Services and as a crisis counselor at Crime
    Victims Services. R. 192-4 (Mikesell Questionnaire) (Page ID #5301, 5306). She wrote that she
    worked closely with the Allen County sheriff’s office, the Lima police department, and the
    juvenile court. 
    Id.
     (Page ID #5302–04). To the prompt “[d]o you know of any reason you could
    not sit as a juror and be absolutely fair to the Defendant and the State of Ohio and render a
    verdict based solely upon the evidence presented you[,]” Mikesell checked “no.” 
    Id.
     (Page ID
    #5308). At voir dire, the judge asked the prospective jurors “do any of you have any personal
    knowledge of the facts of this case?” R. 194-1 (Voir Dire at 13) (Page ID #9181). Mikesell said
    nothing. Id. at 14 (Page ID #9182). The court, the prosecution, and defense counsel confirmed
    that Mikesell knew several of the prosecutors and a defense lawyer from work, that she worked
    at children services, and that she had friends “on the police department,” but Mikesell assured
    the court that she would be impartial. Id. at 24–25, 37, 72, 207–09 (Page ID #9192–93, 9205,
    9240, 9375–77).
    The jury found Cunningham guilty on all counts and specifications and sentenced him to
    death. See Cunningham II, 824 N.E.2d at 512–13. Cunningham appealed his conviction and
    sentence to the Ohio Supreme Court. See id. at 513.
    Nos. 11-3005/20-3429                Cunningham v. Shoop                                  Page 4
    2. State Postconviction Proceedings
    During the pendency of Cunningham’s direct appeal, Jackson’s investigator endeavored
    to interview Cunningham’s jurors. The investigator secured interviews with six members of
    Cunningham’s jury, including foreperson Mikesell and jurors Staci Freeman and Roberta
    Wobler, and an alternate. R. 192-4 (Investigator Rep.) (Page ID #5122). The investigator
    prepared a report of these seven interviews, and he swore to their veracity in an affidavit dated
    July 16, 2003. R. 192-4 (Ericson Aff.) (Page ID #5121). The investigator wrote—
    [Mikesell] said that there was nothing in Jeronique’s life that could have possibly
    explained his participation in the instant offense. She said that Jeronique is an
    evil person. She said that some social workers worked with Jeronique in the past
    and were afraid of him. She also said that if you observe one of the veins starting
    to bulge in his head, watch out and stay away because he might try to kill you.
    She also said that Jeronique had no redeeming qualities. . . . She said that the
    defense knew what she did at children’s services but did not ask her if she had any
    direct information regarding the instant offense. As it turned out, she did not have
    any pertinent information regarding the instant offense but said that the defense
    would not be aware of this.
    R. 192-4 (Investigator Rep.) (Page ID #5132) (emphasis added). Freeman relayed that she voted
    last for finding Cunningham guilty of aggravated murder. Id. (Page ID #5125). “After a while,”
    the report provides, “[Freeman] was convinced by the other jurors that Jeronique had in fact been
    guilty of aggravated murder as opposed to murder.” Id.
    Cunningham timely petitioned for state postconviction relief on August 1, 2003, raising a
    jury-bias claim based on the investigator’s affidavit and report. R. 192-4 (2003 Postconviction
    Pet.) (Page ID #5047, 5085–91). Pointing to Mikesell’s interview, Cunningham asserted that
    Mikesell’s colleagues told her “extraneous” and “highly prejudicial information” that Mikesell
    had failed to divulge during voir dire or in her jury questionnaire.       Id. (Page ID #5087).
    Asserting that his Sixth Amendment right to a trial by an impartial jury and his Fifth and
    Fourteenth Amendment due-process rights were violated, Cunningham requested a new trial or,
    at a minimum, discovery and an evidentiary hearing. Id. (Page ID #5088, 5090–91).
    Nos. 11-3005/20-3429                 Cunningham v. Shoop                                  Page 5
    The state trial court denied Cunningham’s postconviction petition without permitting
    discovery or an evidentiary hearing, and the Ohio Court of Appeals affirmed, reasoning that
    Cunningham asserted that the presence of Juror Number 21, Nichole Mikesell, on
    the jury was prejudicial to him and violated his rights to a fair and impartial
    jury. . . .
    The only comment made by Mikesell that would have any bearing on
    Cunningham’s assertion is that she was provided information by some social
    workers regarding Cunningham. However, the investigator’s interview summary
    of Mikesell does not indicate whether Mikesell obtained this information from the
    social workers prior to, during, or subsequent to Cunningham’s trial. The record
    also does not provide when the investigator conducted these interviews with the
    jurors. However, the record does provide that Mikesell was thoroughly examined
    during the voir dire process and that she informed the court regarding the
    information she had about the case. Mikesell never indicated that she could not
    be a fair and impartial juror.
    State v. Cunningham (Cunningham I), 
    2004 WL 2496525
    , at *15 (Ohio Ct. App. 2004).
    The Ohio Supreme Court denied Cunningham’s claims on direct appeal, Cunningham II,
    824 N.E.2d at 532, and later declined to review Cunningham’s postconviction petition, State v.
    Cunningham, 
    824 N.E.2d 92
     (Ohio 2005).
    3. Federal Habeas Proceedings
    In 2006, Cunningham petitioned for habeas relief. He reasserted that his constitutional
    rights were violated by Mikesell’s knowledge of extrajudicial information about Cunningham.
    R. 19-2 (Habeas Pet. at 7) (Page ID #243). The district court allowed Cunningham to depose the
    jurors, Mikesell’s colleagues at Allen County Children Services, and Jackson’s investigator.
    R. 79 (4/18/08 Mot. at 2–3) (Page ID #1501–02); R. 86 (6/9/08 Order at 10–12) (Page ID #1861–
    63).
    Cunningham acquired affidavits from Freeman and Wobler. R. 104-1 (Freeman Aff. at
    1) (Page ID #1955); R. 103-1 (Wobler Aff. at 1) (Page ID #1952). Freeman averred that during
    guilt-phase deliberations, Mikesell told the other jurors that she worked at the county’s children-
    services agency. R. 104-1 (Freeman Aff. at 1) (Page ID #1955). When Freeman expressed that
    the ballistic evidence pointed to Jackson’s—not Cunningham’s—gun, Mikesell apparently
    Nos. 11-3005/20-3429                  Cunningham v. Shoop                               Page 6
    responded: “[y]ou don’t understand. I know the families of the people that were shot in the
    kitchen. The families know me and I am going to have to go back and see them. These families
    are my clients.” 
    Id.
     at 1–2 (Page ID #1955–56). Freeman “interpreted Mikesell’s comments as
    pressure to vote guilty.” Id. at 2 (Page ID #1956). Wobler attested that “[o]ne young woman on
    the jury was adamant that Jeronique was not guilty. Mikesell told the young woman and the jury
    that the young woman did not have to work in the local community.” R. 103-1 (Wobler Aff. at
    1) (Page ID #1952).
    Cunningham also deposed Mikesell. When pressed about her comments to Jackson’s
    investigator, Mikesell avouched that none of her social-worker colleagues had spoken to her
    about Cunningham but conceded that she had read Cunningham’s files posttrial. R. 188-1
    (Mikesell Dep. at 13–14) (Page ID #2915–16). Mikesell claimed that she had not relayed to the
    other jurors any information from these records. Id. at 14 (Page ID #2916). The presiding
    magistrate judge barred Cunningham’s attorney from asking Mikesell if she worked with or had
    communicated with the victims’ families. Id. at 16–20 (Page ID #2916–17).
    The district court permitted Cunningham to amend his habeas petition to include a second
    juror-bias claim based on Mikesell’s knowledge and relationship with the victims’ families. R.
    111 (3/27/09 Mot. at 4–5) (Page ID #2036–37); R. 120 (7/21/09 Order at 5) (Page ID #2321).
    Denying Cunningham’s request for an evidentiary hearing, the district court permitted
    depositions of Freeman and Wobler instead. R. 120 (7/21/09 Order at 5) (Page ID #2321). The
    district court explained that the necessity of an evidentiary hearing depended on the jurors’
    testimony. Id. at 6 (Page ID #2322).
    Cunningham deposed Freeman and Wobler.          Freeman reiterated that at guilt-phase
    deliberations, Mikesell told the jurors that she “dealt with the victims and their families, they
    knew who she was, and that if she would find him not guilty that she would have to deal with
    them and that’s just something she didn’t want to have to deal with because they knew who she
    was.”    R. 137-1 (Freeman Dep. at 6) (Page ID #2455).           Mikesell’s comments affected
    Freeman—
    Nos. 11-3005/20-3429                       Cunningham v. Shoop                                          Page 7
    I felt, I felt pressured that . . . How do I put this? I think that [Mikesell] . . . I think
    that other people in the room felt pressured. I was honestly the last one holding
    out, and I felt that I was up against a wall, and she was very domineering and so I
    just . . . You know I regret, I shouldn’t have, but I voted guilty. . . . I mean I felt
    the sense in the room, I felt the pressure. She tried to steer everyone towards that.
    Id. at 11 (Page ID #2460).            Freeman did not remember whether she had told Jackson’s
    investigator that she was “[c]onvinced by the other jurors that Jeronique had in fact been guilty
    of aggravated murder as opposed to murder.” Id. at 28–29 (Page ID #2477–78). But, Freeman
    insisted, she had mentioned to the investigator that Mikesell spoke during deliberations about the
    victims’ families. Id. at 15, 18, 19, 20 (Page ID #2464, 2467, 2468, 2469). After reading the
    investigator’s report, however, Freeman confirmed that her remarks to Jackson’s investigator
    were not in the report. Id. at 17–18 (Page ID #2466–67). Wobler likewise averred that Mikesell
    stated in guilt-phase deliberations that she “may in the future be working with the [victims’]
    families.” R. 136-1 (Wobler Dep. at 5) (Page ID #2435). Wobler swore, however, that her
    decision was unaffected by Mikesell’s comments. Id. at 6 (Page ID #2436).1
    The case was subsequently assigned to a different district court, which denied
    Cunningham’s federal habeas petition. See Cunningham v. Hudson, No. 3:06 CV 0167, 
    2010 WL 5092705
    , at *1 (N.D. Ohio Dec. 7, 2010). Applying 
    28 U.S.C. § 2254
    (d)(1) deference, the
    district court found that the Cunningham I court’s treatment of Cunningham’s initial juror-bias
    claim (involving Mikesell’s exposure to external information about Cunningham) neither
    contradicted nor unreasonably applied Supreme Court precedent. Id. at *20. The district court
    further found that Cunningham’s second juror-bias claim (involving Mikesell’s relationship to
    the victims’ families) was unexhausted, procedurally defaulted, and meritless. Id. at *21.
    1Wobler  could not recall having spoken to Jackson’s investigator but confirmed that it was possible.
    R. 136-1 (Wobler Dep. at 12) (Page ID #2442).
    Ohio moved to strike Freeman’s and Wobler’s depositions. R. 142 (3/15/10 Mot.) (Page ID #2504). The
    district court denied Ohio’s motion. R. 155 (5/26/10 Order at 3) (Page ID #2590). To the district court,
    Cunningham’s seeking discovery for his initial juror-bias claim in his state postconviction petition showed that
    Cunningham had diligently attempted to develop the facts underlying his second juror-bias claim in state court. Id.
    Accordingly, the district court reasoned, 
    28 U.S.C. § 2254
    (e)(2) permitted the court to add the depositions to the
    record. 
    Id.
    Nos. 11-3005/20-3429                Cunningham v. Shoop                                  Page 8
    We vacated and remanded. Cunningham v. Hudson, 
    756 F.3d 477
    , 479 (6th Cir. 2014)
    (per curiam). Pointing to the Ohio courts’ obscure interpretations of Ohio Rule of Criminal
    Procedure 33 and Ohio Revised Code § 2953.23(A)(1), we concluded that it was “at least
    debatable” whether Cunningham could raise his second juror-bias claim in a second state
    postconviction petition or a motion for a new trial.            Id. at 485 (citation omitted).
    So Cunningham’s failure to exhaust his second juror-bias claim did not constitute procedural
    default. See id. at 487. The district court held Cunningham’s habeas petition in abeyance to
    allow Cunningham to exhaust his second juror-bias claim in state court. Cunningham v. Hudson,
    No. 3:06 CV 0167, 
    2014 WL 5341703
    , at *1 (N.D. Ohio Oct. 20, 2014).
    4. There and Back Again
    Back in state court, Cunningham filed a second state postconviction petition and a motion
    for a new trial.    He raised his second juror-bias claim in both documents and requested
    discovery, an investigator, an evidentiary hearing, and permission to file the delayed motion. R.
    188-1 (2018 Postconviction Pet. at 1) (Page ID #2828); R. 209-1 (Mot. New Trial at 1) (Page ID
    #11342). The Allen County Court of Common Pleas denied relief, and the Ohio Court of
    Appeals affirmed.    The state appellate court ruled that Cunningham was not “unavoidably
    prevented” from discovering the facts underlying his second juror-bias claim.            State v.
    Cunningham (Cunningham III), 
    65 N.E.3d 307
    , 312–15, 317–18 (Ohio Ct. App. May 23, 2016).
    The appellate court thus concluded that Ohio Revised Code Annotated § 2953.23(A) and Ohio
    Criminal Rule 33 barred Cunningham’s new filings. See id. at 314–15, 317–18. The Ohio
    Supreme Court declined review. State v. Cunningham, 
    77 N.E.3d 987
     (Ohio 2017) (Table).
    Deferring to the state court’s “unavoidably prevented” analysis, the district court found
    that Cunningham procedurally defaulted his second juror-bias claim. See Cunningham v. Shoop,
    No. 3:06 CV 167, 
    2019 WL 6897003
    , at *11–12 (N.D. Ohio Dec. 18, 2019). Cunningham
    appealed the district court’s decision, and we granted his motion to reinstate his initial appeal.
    CA6 No. 11-
    3005 R. 187
     (7/28/20 Order at 2).
    Nos. 11-3005/20-3429                 Cunningham v. Shoop                               Page 9
    B. Analysis
    1. Precedent
    To resolve Cunningham’s juror-bias claims, we consider three canonical cases: Remmer
    v. United States, 
    347 U.S. 227
     (1954); Michael Williams v. Taylor, 
    529 U.S. 420
     (2000); and
    Cullen v. Pinholster, 
    563 U.S. 170
     (2011).
    a. Juror Bias: Remmer
    In Remmer, the Supreme Court held that a prima facie showing of juror bias—such as an
    allegation of “any private communication, contact, or tampering directly or indirectly, with a
    juror during a trial about the matter pending before the jury” in a criminal case—entitles a
    defendant to a hearing, awards to the defendant a presumption of prejudice, and places on the
    Government the burden of showing that the contact was harmless. Remmer, 
    347 U.S. at 229
    .
    The Court followed up in Smith v. Phillips: “This Court has long held that the remedy for
    allegations of juror partiality is a hearing in which the defendant has the opportunity to prove
    actual bias.” 
    455 U.S. 209
    , 215 (1982) (emphasis added). Put another way, the Phillips Court
    reaffirmed Remmer’s core holding that a showing of juror bias demands a hearing. See United
    States v. Zelinka, 
    862 F.2d 92
    , 94–95 (6th Cir. 1988); United States v. Herndon, 
    156 F.3d 629
    ,
    635 (6th Cir. 1998).    Subsequent Supreme Court decisions that address Remmer hearings
    confirm as much. See, e.g., United States v. Olano, 
    507 U.S. 725
    , 738–39 (1993); Rushen v.
    Spain, 
    464 U.S. 114
    , 119–20 (1983).
    The courts of appeals were forced to grapple with whether Phillips shifted the burden of
    proof at a Remmer hearing from the Government to the defendant and whether the presumption
    of prejudice survived Phillips. Every other circuit maintains that the Government shoulders the
    burden at a Remmer hearing of showing that the alleged juror bias was harmless and has
    reaffirmed that defendants are awarded a presumption of prejudice at that hearing. See B.
    Samantha Helgason, Opening Pandora’s Jury Box, 89 FORDHAM L. REV. 231, 242–43, 249–50
    (2020); Sheppard v. Bagley, 
    657 F.3d 338
    , 350 n.1 (6th Cir. 2011) (Merritt, J., dissenting)
    (collecting cases). We charted our own course. In Zelinka, we reiterated that Remmer “outlined
    Nos. 11-3005/20-3429                 Cunningham v. Shoop                              Page 10
    the procedure that district courts should follow when advised of unauthorized contacts with a
    juror”—
    The trial court should not decide and take final action ex parte on information
    such as was received in this case, but should determine the circumstances, the
    impact thereof upon the juror, and whether or not it was prejudicial, in a hearing
    with all interested parties permitted to participate.
    Zelinka, 
    862 F.2d at
    94–95 (quoting Remmer, 
    347 U.S. at
    229–30). We nonetheless concluded
    that Phillips shifted the burden of showing bias at Remmer hearings to defendants and stripped
    defendants of the presumption of prejudice.      See 
    id.
     at 95–96.    Notwithstanding, we still
    guarantee defendants a “meaningful opportunity” to demonstrate juror bias, United States v.
    Lanier, 
    988 F.3d 284
    , 295 (6th Cir. 2021) (quoting Herndon, 
    156 F.3d at 637
    ), and maintain that
    bias may be actual (“bias in fact”) or implied (“employ[ing] a conclusive presumption that a
    juror is biased” in “certain ‘extreme’ or ‘exceptional’ cases”), Treesh v. Bagley, 
    612 F.3d 424
    ,
    437 (6th Cir. 2010) (citations omitted).
    b. AEDPA: Michael Williams and Pinholster
    In Michael Williams, the Court held that when the state courts have not adjudicated a
    habeas petitioner’s claims on the merits and the petitioner diligently attempted to develop the
    facts of that claim in state courts, 
    28 U.S.C. § 2254
    (e)(2) permits federal courts to hold an
    evidentiary hearing for that claim. See Michael Williams, 
    529 U.S. at 437
    .
    Michael Wayne Williams was convicted of a capital crime. See 
    id. at 426
    . He petitioned
    for postconviction relief in the Virginia courts, alleging that the Commonwealth had failed to
    disclose its unofficial deal with one of the witnesses. See 
    id. at 427
    . The Virginia Supreme
    Court dismissed the petition. See 
    id.
     Williams sought federal habeas relief. See 
    id.
     He reraised
    his undisclosed-agreement claim and set forth three new claims. Williams now alleged that
    Virginia violated Brady v. Maryland, 
    373 U.S. 83
     (1963), by failing to disclose a pretrial
    psychiatric examination of the same witness. Michael Williams, 
    529 U.S. at 427
    . He also raised
    a juror-bias claim and a prosecutorial-misconduct claim. See 
    id.
     One of Williams’s jurors was
    formerly married to a witness for Virginia, and one of the prosecutors had represented the juror
    in the divorce proceedings. See 
    id.
     at 440–41. At voir dire, when the judge asked if any of the
    Nos. 11-3005/20-3429                       Cunningham v. Shoop                                          Page 11
    prospective jurors were related to the witnesses, the juror said nothing. See 
    id.
     And when the
    judge asked if any of the prospective jurors had been represented by the attorneys involved in the
    case, both the juror and the prosecutor remained silent. See 
    id. at 441
    .
    The Michael Williams Court addressed whether 
    28 U.S.C. § 2254
    (e)(2) barred a federal
    habeas court from holding an evidentiary hearing for these four claims. See id. at 432. Per that
    provision, “[i]f the applicant has failed to develop the factual basis of a claim in State court
    proceedings, the [federal habeas] court shall not hold an evidentiary hearing on the claim unless
    the applicant shows that” they meet both exceptions listed in § 2254(e)(2)(A) and (B). 
    28 U.S.C. § 2254
    (e)(2). The Court underscored that “failed to develop” turned on “diligence.” Michael
    Williams, 
    529 U.S. at 432
    .
    Because Williams diligently explored the facts underlying his juror-bias and
    prosecutorial-bias claims, the Court concluded that the federal courts could hold a § 2254(e)(2)
    evidentiary hearing for those two claims. See id. at 440–44. But the Court determined that
    Williams had not diligently developed his Brady claim. See id. at 437–38. The Court also
    punted Williams’s failure-to-disclose claim. See id. at 444. Unlike the three new federal habeas
    claims, the Virginia Court of Appeals had rejected the failure-to-disclose claim on the merits,
    implicating 
    28 U.S.C. § 2254
    (d)(1)’s deferential standards of review of state courts’ merits
    decisions. The Michael Williams Court therefore found it “unnecessary to reach the question
    whether § 2254(e)(2) would permit a hearing on th[at] claim.” Id.
    The Court addressed the relationship between § 2254(d)(1) and (e)(2) more than a decade
    later in Pinholster. There, the Court concluded that federal courts must limit their review of a
    state court’s merits adjudication to the record before that state court. Pinholster, 
    563 U.S. at 181
    .
    Thus, federal courts cannot consider evidence yielded at federal habeas evidentiary hearings
    when reviewing state courts’ merits decisions. See 
    id.
     at 185–86.2
    2The  Pinholster Court reiterated Michael Williams’s analysis of § 2254(e)(2)’s application to claims that
    had not been adjudicated by state courts on the merits and reasoned further that Michael Williams’s leaving open the
    § 2254(d)(1) question “supported” the outcome in Pinholster. See Pinholster, 
    563 U.S. at
    183–86.
    Nos. 11-3005/20-3429                  Cunningham v. Shoop                                 Page 12
    Faithfully applying Remmer, Michael Williams, and Pinholster, we conclude that
    Cunningham is entitled to an evidentiary hearing for both his juror-bias claims.
    2. Juror-Bias Claim #1
    The Cunningham I court adjudicated Cunningham’s first juror-bias claim—that
    Mikesell’s social-worker colleagues fed her information about Cunningham—on the merits. Per
    
    28 U.S.C. § 2254
    (d)(1) and Pinholster, the appropriate inquiry is whether Cunningham I was
    contrary to or unreasonably applied Supreme Court precedent based on the record before it. See
    Terry Williams v. Taylor, 
    529 U.S. 362
    , 405–11 (2000) (O’Connor, delivering majority opinion
    for standards governing § 2254(d)(1)’s contrary-to and unreasonable-application clauses);
    Harrington v. Richter, 
    562 U.S. 86
    , 102 (2011) (promulgating fairminded-jurists-could-disagree
    standard for § 2254(d)(1) unreasonable-application inquiry); Renico v. Lett, 
    559 U.S. 766
    , 779
    (2010) (explaining that decisions issued by courts of appeals do not constitute clearly established
    Supreme Court precedent for § 2254(d) purposes). So—as Ohio points out, Appellee’s Br. #2 at
    55—we may consider the investigator’s affidavit and interview report that were presented to the
    state court, but we cannot include the affidavits and depositions generated during the federal
    habeas proceedings.
    We hold that Cunningham I unreasonably applied Remmer. Phillips retained Remmer’s
    core holding that a prima facie showing of juror bias entitles a defendant to an evidentiary
    hearing. See Phillips, 
    455 U.S. at 215
     (“[T]he remedy for allegations of juror partiality is a
    hearing . . . .” (emphasis added)). By attaching evidence to his state postconviction petition that
    raised the question whether Mikesell had spoken to her colleagues about him, Cunningham
    credibly alleged that a “private communication [occurred] . . . with a juror during a trial about the
    matter pending before the jury . . . .” Remmer, 
    347 U.S. at 229
    . This colorable claim of
    extraneous influence entitled Cunningham to a Remmer hearing. See id.; see also Herndon, 
    156 F.3d at 635
     (“Where a colorable claim of extraneous influence has been raised . . . a ‘Remmer
    hearing’ is necessary to provide the defendant with ‘the opportunity to prove actual bias.’”
    (quoting Phillips, 
    455 U.S. at 217
    )); Garcia v. Andrews, 
    488 F.3d 370
    , 376 (6th Cir. 2007))
    (“This court has defined ‘an extraneous influence on a juror [as] one derived from specific
    knowledge about or a relationship with either the parties or their witnesses.’” (alteration in
    Nos. 11-3005/20-3429                  Cunningham v. Shoop                                  Page 13
    original) (quoting Herndon, 
    156 F.3d at 635
    )); Ewing v. Horton, 
    914 F.3d 1027
    , 1030 (6th Cir.
    2019) (“When a trial court is presented with evidence that an extrinsic influence has reached the
    jury which has a reasonable potential for tainting that jury, due process requires that the trial
    court take steps to determine what the effect of such extraneous information actually was on that
    jury. In other words, where a colorable claim of extraneous influence has been raised, an
    evidentiary hearing must be held to afford the defendant an opportunity to establish actual bias.”
    (cleaned up)).
    The dissent notes that only our circuit precedent addressing juror bias on direct appeal
    uses the term “colorable claim,” and as such, per § 2254(d)(1), we may not rely on it in
    analyzing the state court’s interpretation of Remmer. Dissent Op. at 54. Requiring only a prima
    facie (i.e., colorable) claim of prejudice, however, is the only sensical interpretation of Remmer,
    which is Supreme Court precedent.          Remmer instructed the trial court to “determine the
    circumstances, the impact thereof upon the juror, and whether or not it was prejudicial, in a
    hearing” based on “information such as was received in this case,” but the point of that rule was
    to direct the district court to inquire further into the defendant’s credible allegations. 
    347 U.S. at
    229–30. That language cannot be reduced to a mere “data point,” and cannot be reasonably
    interpreted, as the dissent suggests, to limit the future application of Remmer to its precise facts.
    Dissent Op. at 55.
    Nor does our requisite level of deference to Ohio courts require us to accept an
    unreasonable application of Remmer’s rule solely because Remmer involved different allegations
    of outside influence. See Panetti v. Quarterman, 
    551 U.S. 930
    , 953 (2007) (“AEDPA does not
    ‘require state and federal courts to wait for some nearly identical factual pattern before a legal
    rule must be applied.’” (quoting Carey v. Musladin, 
    549 U.S. 70
    , 81 (2006))). Whether the
    defendant alleges that a third party offered a juror a bribe, as in Remmer, or that a third party
    provided a juror with outside information she otherwise would not have known, the principle is
    the same: a defendant must be afforded a chance to prove the juror’s bias in a Remmer hearing.
    See Phillips, 
    455 U.S. at 216
     (“Preservation of the opportunity to prove actual bias is a guarantee
    of a defendant's right to an impartial jury.” (quoting Dennis v. United States, 
    339 U.S. 162
    , 167
    (1950))).
    Nos. 11-3005/20-3429                      Cunningham v. Shoop                           Page 14
    Ohio insists, and the dissent agrees, that Cunningham has not provided any evidence that
    Mikesell used extrajudicial information while a member of the jury. See Appellee’s Br. #2 at 21;
    Dissent Op. at 55–56. But Ohio has skipped a constitutional step. In Remmer, the Court did not
    require the defendant to prove “what actually transpired, or whether the incidents that may have
    occurred were harmful or harmless” before receiving an evidentiary hearing. 
    347 U.S. at 229
    .
    Again, Phillips reiterated Remmer’s guarantee that a prima facie showing of juror bias entitles a
    defendant to an evidentiary hearing—“allegations of juror partiality” suffice. 
    455 U.S. at 215
    (emphasis added). Per Remmer,—which, contrary to the dissent’s interpretation, also involved a
    “degree of speculation”—a hearing was the appropriate forum for a trial court to decide the
    nature, timing, and content of any communications about Cunningham between Mikesell and her
    colleagues. To receive a Remmer hearing, Cunningham had to colorably allege that the jury
    encountered extraneous influence—which he did in his state postconviction petition. The state
    appellate court thus unreasonably dismissed Cunningham’s first juror-bias claim based on the
    interview report.
    The Cunningham I court erroneously homed in on Mikesell’s statements during voir dire.
    Cf. Cunningham I, 
    2004 WL 2496525
    , at *15.3 Yes, Mikesell proclaimed that she could be fair
    and impartial notwithstanding that she had worked with members of the police department, the
    prosecution, and the defense. But Mikesell’s relationship with the Ohio justice system’s repeat
    players is immaterial to whether her colleagues may have provided her with external information
    during trial. Nothing otherwise stated in Mikesell’s jury questionnaire or during voir dire would
    have flagged to Cunningham’s trial counsel that Mikesell might have been discussing this case
    with her colleagues. Indeed, Mikesell confirmed that her employment at Allen County Children
    Services would not affect her partiality without saying more. Her statement weighs in favor—
    not against—finding that Cunningham’s lawyers had no notice that Mikesell or her colleagues
    possessed extrajudicial information about him.
    3The   district court similarly erred. See Cunningham, 
    2019 WL 6897003
    , at *20.
    Nos. 11-3005/20-3429                 Cunningham v. Shoop                              Page 15
    The Cunningham I court’s unsound reasoning that “the record [] does not provide when
    the investigator conducted these interviews with the jurors” puts us at sea. Cunningham I, 
    2004 WL 2496525
    , at *15. Neither Remmer nor Phillips states that the timing of a defendant’s
    allegation of an external contact erases their right to an evidentiary hearing.      Indeed, the
    defendant in Remmer learned about an impermissible external contact between his jury
    foreperson and the FBI after his verdict came in—just like this case. See Remmer, 
    347 U.S. at 228
    . Citing the timing of the juror interviews to deny Cunningham any investigation into juror
    bias involves an unreasonable application of Remmer. The interviewer’s affidavit, moreover, is
    dated July 16, 2003.    R. 192-4 (Ericson Aff.) (Page ID #5121). Clearly, the investigator
    interviewed the jurors between Cunningham’s sentencing on June 23, 2002 and the affidavit’s
    signing on July 16, 2003. See R. 192-2 (Sentencing Order at 8) (Page ID #4326); R. 192-4 (2003
    Postconviction Pet.) (Page ID #5047). Because the record indicates the period during which
    these interviews occurred, the Cunningham I court “unreasonabl[y] determine[ed] the facts in
    light of the evidence presented in the State court proceeding.” 
    28 U.S.C. § 2254
    (d)(2). “This
    partial reliance on an erroneous factual finding further highlights the unreasonableness of the
    state court’s decision.” Wiggins v. Smith, 
    539 U.S. 510
    , 528 (2003).
    That Mikesell told Jackson’s investigator that she did not have “pertinent” or “direct”
    information about Cunningham’s “instant offense” is inapposite. R. 192-4 (Investigator Rep.)
    (Page ID #5132). Consider our recent decision in Ewing. In that habeas case, Ewing was
    convicted of a gang-related murder. One of Ewing’s jurors filed an affidavit postverdict. She
    swore that two other jurors mentioned during deliberations that they had looked up a picture of
    Ewing on Facebook; had read a eulogy online about the victim; and Googled information about
    gang codes, history, and hierarchy.     Based on that affidavit alone, the State of Michigan
    conceded, and this court agreed, that Ewing deserved a Remmer hearing. Ewing, 914 F.3d at
    1029–30. We emphasized that the external information “had a clear potential for tainting the
    jury.” Id. at 1030. We were unswayed by the Michigan Court of Appeals’s determination “that
    the extraneous information was duplicative of evidence produced at trial and thus harmless”; that
    the Facebook picture was “innocuous and similar to many photos that were shown at trial”; that
    “Watson’s eulogy contained no new, relevant information and presumably was discussed only in
    Nos. 11-3005/20-3429                       Cunningham v. Shoop                                          Page 16
    passing”; and that “the information about gang activity and hierarchy was either patently obvious
    or easily inferred from witness testimony.” Id. at 1029–30.
    Likewise, any information that Mikesell’s social-worker colleagues may have told her
    about Cunningham or that she learned from reading his file poses a glaring risk of taint.4
    Consider what Mikesell told Jackson’s investigator. Mikesell stated that “there was nothing in
    Jeronique’s life that could have possibly explained his participation in the instant offense” and
    that “Jeronique is an evil person.” R. 192-4 (Investigator Rep.) (Page ID #5132). She mentioned
    that “some social workers worked with Jeronique in the past and were afraid of him” before
    explaining “if you observe one of the veins starting to bulge in his head, watch out and stay away
    because he might try to kill you.” Id. She closed with: “Jeronique had no redeeming qualities.”
    Id. Of course, we cannot tell from the investigator’s report whether Mikesell developed these
    strong opinions because of information learned at trial or from her colleagues; a Remmer hearing
    is the appropriate forum to discern the answer. Just like the photo, eulogy, and gang information
    in Ewing, the information that might have been relayed to Mikesell is just as irrelevant to the
    crime but equally as charged with bias.                 Clearly, the prejudicial nature of the external
    information does not rise and fall on whether the information is “pertinent” or “direct[ly]”
    connected to a habeas petitioner’s “instant offense.” R. 192-4 (Investigator Rep.) (Page ID
    #5132).
    We are aware that the district court allowed Cunningham to conduct limited depositions
    of three of the jurors—Freeman, Wobler, and Mikesell. And during her deposition, Mikesell
    denied that she spoke to her colleagues about Cunningham or read from his file during the trial.
    Even if we could consider the affidavits and depositions—which, again, we cannot under
    4The dissent portrays Cunningham’s claim of juror bias as “an allegation that, a year after trial Mikesell
    knew that some of her colleagues were afraid of Cunningham” and concludes that this “allegation, taken as true, is
    not nearly as prejudicial on its face as the bribery allegation in Remmer was.” Dissent Op. at 55. The dissent both
    mischaracterizes Cunningham’s allegations and conflates his allegations with one sentence in the investigative
    report read in isolation. Cunningham alleges that the information in the investigator’s report, read in context with
    Mikesell’s other statements and the timing of the investigation, plausibly give rise to an inference that Mikesell
    received during the trial information about Cunningham from social workers or Cunningham’s case file. That
    allegation—that Mikesell received during the trial outside information that social workers were afraid of
    Cunningham—taken as true, is even more prejudicial than an FBI agent’s inquiring about the juror’s own conduct in
    Remmer. 
    347 U.S. at 229
    .
    Nos. 11-3005/20-3429                         Cunningham v. Shoop                                           Page 17
    Pinholster—we would still grant Cunningham a Remmer hearing. Remmer was unambiguous:
    an allegation of extraneous influence entitles a defendant to a constitutionally meaningful
    investigation into juror bias at a hearing. Of course, we accord deference to state courts’
    management of Remmer hearings in habeas cases per § 2254(d)(1). See Carroll v. Renico,
    
    475 F.3d 708
    , 712 n.3 (6th Cir. 2007). But no Remmer hearing occurred on this juror-bias claim
    in the Ohio courts. And the depositions taken in the federal habeas proceeding did not comport
    with the constitutional contours of a Remmer hearing. See Lanier, 988 F.3d at 295. Because the
    jurors were deposed outside the presence of the district judge, no factfinder had the opportunity
    to assess Mikesell’s credibility as she testified that she did not talk to her coworkers about
    Cunningham and did not review his file until after the trial was over. The greater the probability
    of juror bias, moreover, the more searching the court’s investigation must be. See id. Mikesell’s
    statement to Jackson’s investigator indicated bias against Cunningham. Freeman and Wobler
    also supplied evidence that Mikesell knew the victims’ families (we explore this issue below).
    The discovery permitted in the habeas proceeding is not the constitutional equivalent of a
    Remmer hearing. The district court’s permitting defense counsel to question just three jurors and
    the magistrate judge’s limiting the scope of Mikesell’s deposition placed unconstitutional
    constraints on defense counsel. To that end, Mikesell’s denying during her deposition that she
    spoke to her colleagues does not eliminate Cunningham’s entitlement to a proper Remmer
    hearing, and we must remand because we cannot say on this record that the failure to provide a
    Remmer hearing was harmless. See Nian v. Warden, N. Cent. Corr. Inst., 
    994 F.3d 746
    , 756 (6th
    Cir. 2021).5
    5We  have treated a trial court’s failure to hold a Remmer hearing as a “trial error” subject to harmless-error
    review. See Nevers v. Killinger, 
    169 F.3d 352
    , 370–73 (6th Cir. 1999), abrogated on other grounds by Harris v.
    Stovall, 
    212 F.3d 940
     (6th Cir. 2000) (trial court’s failure to investigate extraneous influence on jury was trial error
    subject to harmless-error review); Nian, 994 F.3d at 756 (ordering Remmer hearing because state court’s failure to
    hold Remmer hearing for allegation of extraneous influence was not harmless).
    Here, Cunningham’s first juror-bias claim, which involves allegations of extraneous information learned
    from Mikesell’s coworkers and a casefile, fits into the framework we applied in other cases where there were
    allegations of extraneous influence during the trial. See, e.g., Nevers, 
    169 F.3d at 354
    ; Nian, 994 F.3d at 753;
    Ewing, 914 F.3d at 1030. After a hearing, the trial court will be well equipped to make a finding whether the state
    court’s Remmer error in this case was harmless. See, e.g., Barnes v. Joyner, 
    751 F.3d 229
    , 253 (4th Cir. 2014)
    (remanding habeas petition to district court to hold Remmer hearing on claim of extraneous influence and to make
    harmless error determination).
    Nos. 11-3005/20-3429                       Cunningham v. Shoop                                          Page 18
    To sum up, Cunningham’s first state postconviction petition set forth a prima facie case
    of extraneous influence, i.e., that Mikesell’s colleagues at Allen County Children Services or
    Mikesell’s review of Cunningham’s file relayed to her external information about Cunningham.
    The Cunningham I court unreasonably applied Remmer by refusing to grant Cunningham an
    evidentiary hearing. Cunningham is thus entitled to an evidentiary hearing for his first juror-bias
    claim involving Mikesell’s obtaining prejudicial information about Cunningham from her
    colleagues or his file.
    3. Juror-Bias Claim #2
    To refresh, the Cunningham III court decided that it could not entertain Cunningham’s
    second postconviction petition or motion for a new trial under Ohio law and refused to consider
    on the merits Cunningham’s second juror-bias claim involving Mikesell’s relationship with the
    victims’ family. Cunningham III, 65 N.E.3d at 315, 317.6 “It is axiomatic that state courts are
    the final authority on state law.” Hutchison v. Marshall, 
    744 F.2d 44
    , 46 (6th Cir. 1984). And
    6During   oral argument, Ohio contradicted its brief’s position that Cunningham procedurally defaulted his
    second juror-bias claim by arguing for the first time that the Ohio Court of Appeals adjudicated this claim on the
    merits. Compare Appellee’s Br. #2 at 17–18, with Oral Arg. at 33:00–35:24. Ohio pointed to this sentence in
    Cunningham III: “Even were we to consider Cunningham’s arguments that he satisfied R.C. 2953.23(A)(1)(b), we
    would conclude that he has not shown that, but for any purported constitutional error at trial, no reasonable fact-
    finder would have found him guilty of the offenses or found him eligible for a death sentence.” Cunningham III,
    65 N.E.3d at 315; Oral Arg. at 34:41–35:17.
    After focusing on this sentence, we remain unswayed by Ohio’s belated argument. In the paragraph
    preceding this single sentence, the Ohio Court of Appeals determined that Cunningham’s failure to satisfy Ohio
    Rev. Code § 2953.23(A)(1)(a) “alone” deprived the state courts of “jurisdiction” to review Cunningham’s second
    postconviction petition. Id. No doubt, the Ohio Court of Appeals clearly, expressly, and actually rested its
    judgment on a state procedural bar. See Harris v. Reed, 
    489 U.S. 255
    , 263 (1989); Williams v. Coyle, 
    260 F.3d 684
    ,
    693 (6th Cir. 2001). The in-the-alternative analysis following the words “even were we” is detached from the state
    appellate court’s conclusive procedural determination. No one, for that matter, can read Ohio’s selective slice of
    Cunningham III as a merits adjudication of anything. The Ohio Court of Appeals merely reasoned that
    Cunningham’s allegation of a structural error such as juror bias is insufficient to satisfy Ohio Rev. Code
    § 2953.23(A)(1)(b). See Cunningham III, 65 N.E.3d at 315–16. So the Ohio Court of Appeals issued yet another
    procedural determination—not a merits decision. To the extent that one could read Ohio’s chosen sentence as a
    merits adjudication of Cunningham’s innocence of the alleged crime or innocence of the death penalty (which would
    demand a dubious and implausible linguistic stretch), deciding Cunningham’s innocence is not pertinent to whether
    Mikesell was biased. Put simply: no merits determination of any juror-bias issue can be found anywhere in
    Cunningham III. Finally, if we did read this sentence, somehow, as a merits determination of the second juror-bias
    claim, Cunningham still prevails for the same reason that he succeeds for his first juror-bias claim. Per Remmer,
    there has been a credible allegation of juror bias via Mikesell’s relationship with the victims’ families. So if the
    Cunningham III court had denied Cunningham an evidentiary hearing on the merits, it unreasonably applied
    Remmer. But because no merits adjudication occurred in Cunningham III—which Ohio maintained all the way until
    our oral argument—we invoke § 2254(e)(2) instead of § 2254(d)(1).
    Nos. 11-3005/20-3429                  Cunningham v. Shoop                              Page 19
    we must presume that the Cunningham III court’s factual findings are correct absent clear and
    convincing evidence to the contrary. See 
    28 U.S.C. § 2254
    (e)(1). But a faithful application of
    Michael Williams reveals that we may order an evidentiary hearing for this juror-bias claim
    under § 2254(e)(2).
    First, Cunningham was at least as diligent as Williams had been about pursuing a remedy
    in state court. In Michael Williams, state postconviction counsel “did attempt to investigate
    [Williams’s] jury” by petitioning for funding for an investigator “to examine all circumstances
    relating to the empanelment of the jury and the jury’s consideration of the case.” Michael
    Williams, 529 U.S. at 442 (citations omitted). By denying this request, Virginia “depriv[ed]
    [Williams] of a further opportunity to investigate.” Id. The Court did not care that Williams’s
    state postconviction petition was “prompted by concerns about a different juror” from the juror
    underlying his federal habeas juror-bias claim. Id. Nor did the Court alter its conclusion because
    the state postconviction petition contained mere “vague allegations” that “irregularities,
    improprieties and omissions exist[ed] with respect to the empaneling [sic] of the jury.” Id.
    (alterations and emphasis in original, citation omitted).
    Here, Cunningham sought an evidentiary hearing and discovery from the Ohio courts for
    his initial juror-bias claim; his claim was more concrete and substantiated than Williams’s
    obscure juror-bias allegation had been. Compare R. 192-4 (2003 Postconviction Pet.) (Page ID
    #5085–91), with Michael Williams, 529 U.S. at 442. Because “[d]iligence will require in the
    usual case that the prisoner, at a minimum, seek an evidentiary hearing in state court in the
    manner prescribed by state law,” Cunningham crossed the Court’s diligence threshold. See
    Michael Williams, 529 U.S. at 437; see also Bowling v. Parker, 
    344 F.3d 487
    , 511–12 (6th Cir.
    2003); Robinson v. Howes, 
    663 F.3d 819
    , 824 (6th Cir. 2011); cf. Keeling v. Warden, Lebanon
    Corr. Inst., 
    673 F.3d 452
    , 465 (6th Cir. 2012).
    Second, Cunningham had as little notice as Williams had about the facts underlying their
    respective juror-bias claims. In Michael Williams, the Court explained that nothing in the record
    would have notified a reasonable attorney that the juror deliberately omitted material information
    by remaining silent in voir dire. See Michael Williams, 529 U.S. at 442. So too here. The jury
    questionnaire and the voir dire transcript do not indicate that Mikesell was connected to the
    Nos. 11-3005/20-3429                Cunningham v. Shoop                               Page 20
    victims’ families. As in Michael Williams, Mikesell said nothing when the trial court asked if
    any prospective jurors had personal knowledge of the case. The investigator’s comprehensive
    interview report also never mentions Mikesell’s relationship with the victims’ families. Put
    simply, nothing Mikesell wrote in her questionnaire, nothing Mikesell said at voir dire, and
    nothing in the interview report would have alerted a reasonable attorney about Mikesell’s
    connection to the victims.    Cf. Hutchison v. Bell, 
    303 F.3d 720
    , 747–48 (6th Cir. 2002)
    (concluding that petitioner failed diligently to develop facts underlying Brady claim when
    prosecution referred to undisclosed report at closing arguments, petitioner personally spoke to
    report’s author, and subject of report came up in cross-examination).
    We accept that Freeman may have told Jackson’s investigator that Mikesell had brought
    up the victims’ families at deliberations, but we deem this fact inapposite. In Michael Williams,
    the Court rejected the argument that Williams was not diligent because his state postconviction
    investigator would have discovered the juror’s earlier marriage in the county’s public records—
    We should be surprised, to say the least, if a district court familiar with the
    standards of trial practice were to hold that in all cases diligent counsel must
    check public records containing personal information pertaining to each and every
    juror. Because of [the juror’s] and [the prosecutor’s] silence, there was no basis
    for an investigation into [the juror’s] marriage history.
    Michael Williams, 529 U.S. at 443. That “[t]he investigator later confirmed [the juror’s] prior
    marriage to [the witness] by checking Cumberland County’s public records” did not sway the
    Court. Id. In short, the Court refused to draw the diligence bright line at what Williams could
    have discovered and underscored that diligence turned on notice. Turning back to the present
    case, we note that Freeman insisted that she had told the investigator about Mikesell’s remarks
    about the victims’ families during deliberations. R. 137-1 (Freeman Dep. at 15, 18, 19, 20)
    (Page ID #2464, 2467, 2468, 2469). But Freeman herself read the interview report, and she
    confirmed that the report contained no mention of her comments to the investigator about
    Mikesell. Id. at 18 (Page ID #2467). Ohio conceded at oral argument that Freeman’s comments
    are not in the report. See Oral Arg. at 45:58–47:57. We cannot expect Cunningham’s state
    postconviction counsel to read tea leaves in an empty cup. Because the report could not have
    Nos. 11-3005/20-3429                  Cunningham v. Shoop                                Page 21
    notified Cunningham’s state postconviction counsel about Mikesell’s relationship with the
    victims’ families, what Freeman may have said to the investigator does not alter our outcome.
    Third, Cunningham III sealed the diligence deal. In Michael Williams, the Court noted
    that state postconviction relief was unavailable to Williams when he had discovered the factual
    bases of his juror-bias and prosecutorial-misconduct claims. See Michael Williams, 529 U.S. at
    443. At the time, Virginia law required indigent petitioners to file a state postconviction petition
    within 120 days of appointment of state postconviction counsel. See id. at 443–44 (citing VA.
    CODE ANN. § 8.01–654.1 (1999)). But Williams’s federal habeas investigator discovered the
    juror’s connections to the witness and the prosecutor long after that deadline. See id. at 444. So
    it was futile for Williams to return to the Virginia courts. See id.
    Here, Cunningham discovered the facts underlying his second juror-bias claim after the
    Cunningham I court rejected his first postconviction petition. When this case initially arrived at
    our doorstep, Cunningham urged us that “[u]nder Ohio law, . . . there is simply no avenue for
    postconviction petitioners to obtain discovery.” Appellant’s Br. #1 at 23. Ohio countered that
    Cunningham “could and should have” presented this claim in the state courts because AEDPA
    guarantees habeas petitioners a “fair opportunity” in state courts to raise a constitutional claim.
    See Appellee’s Br. #1 at 46. Because murky Ohio precedent did not clearly explain whether the
    state courts could hear this claim, we ordered Cunningham to attempt to seek relief in the Ohio
    courts. See Cunningham, 756 F.3d at 485.
    By refusing to consider the merits of the claim, the Cunningham III court vindicated
    Cunningham’s interpretation of Ohio law. Clearly, it was always “futile” for Cunningham to
    return to the Ohio courts. Like Williams, Cunningham “cannot be said to have failed to develop
    [his claims] in state court by reason of having neglected to pursue remedies available under
    [Ohio] law.” Michael Williams, 529 U.S. at 444. Indeed, futility is clearer here than it was in
    Michael Williams. Conceivably, the Virginia courts could have interpreted state postconviction
    or equitable law to allow the commonwealth’s courts to hear Williams’s claim notwithstanding
    the state’s filing deadline. Yet Williams never tried to file his three new habeas claims with the
    Virginia courts. See Michael Williams, 529 U.S. at 444. Compare Williams to Cunningham,
    Nos. 11-3005/20-3429                  Cunningham v. Shoop                                Page 22
    who sought and failed to obtain relief from the state courts. In this way, Cunningham acted more
    diligently than Williams had.
    We address one crinkle in this case. As we mentioned, Virginia’s postconviction-petition
    procedures had a hard filing deadline for indigent petitioners when Michael Williams was
    decided.   See VA. CODE ANN. § 8.01–654.1 (1999)).              Ohio’s rules governing second or
    successive habeas petitions and motions for a new trial also have filing deadlines. See OHIO
    REV. CODE ANN. 2953.21(A)(2) (2014); OHIO R. CRIM. P. 33(B) (2014). But Ohio excepts from
    the filing deadlines incarcerated persons who were “unavoidably prevented” from developing the
    facts underlying their claim. See OHIO REV. CODE ANN. 2953.23(A)(1)(a) (2014); OHIO R. CRIM.
    P. 33(B) (2014). Virginia’s statute contained no such exception; so the face of Virginia’s statute
    made it “futile” for Williams to return to state court. Cunningham, by contrast, is not barred
    from pursuing state remedies by the black letter of Ohio’s statutes and rules. Rather, the Ohio
    Court of Appeals’s conclusion that Cunningham was not “unavoidably prevented” from
    developing the facts has rendered futile his return to state court.
    This interstice between Ohio law in 2014 and Virginia law in 1999 does not rupture
    Cunningham’s case. For one, Michael Williams’s futility analysis did not rise and fall on the
    reason why Williams could not return to the state courts. The Court merely determined that
    because “state postconviction relief was no longer available at the time the facts came to light, it
    would have been futile for petitioner to return to the Virginia courts.” Michael Williams,
    529 U.S. at 444. So too for Cunningham. After all, Cunningham III erased any doubt—
    Cunningham was never able to seek relief for his second juror-bias claim in the state courts.
    Nor is the Ohio Court of Appeals’s “unavoidably prevented” determination relevant to
    our § 2254(e)(2) diligence analysis. For one, diligence “is a question of federal law decided by
    federal habeas courts.” Boyle v. McKune, 
    544 F.3d 1132
    , 1136 (10th Cir. 2008); see also
    Michael Williams, 529 U.S. at 429–38 (referring to no state-court findings and zero state law in
    promulgating and applying its diligence standards). “Unavoidably prevented,” on the other
    hand, is a question of Ohio law. See Cunningham III, 65 N.E.3d at 314–15 (citing State v.
    Creech, 
    2013 WL 4735469
    , at *4 (Ohio Ct. App. Aug. 27, 2013)). Therefore, even after taking
    the Cunningham III court’s findings of fact as true, see 
    28 U.S.C. § 2254
    (e)(1), and deferring
    Nos. 11-3005/20-3429                Cunningham v. Shoop                               Page 23
    wholly to Cunningham III’s interpretation of state law that controlled when Cunningham sought
    an evidentiary hearing, Boyle, 
    544 F.3d at 1136
    , nothing in Cunningham III alters our diligence
    analysis.
    To illustrate how the “unavoidably prevented” and diligence analyses are distinct,
    contrast Cunningham III with Michael Williams. The state appellate court, for example, cited
    state common law in reasoning that Cunningham’s claim of ineffective assistance of state
    postconviction counsel suggests that his juror-bias claim could have been uncovered if he had
    been reasonably diligent. Cunningham III, 65 N.E.3d at 314. But the Supreme Court reasoned
    to the contrary—Williams’s state postconviction counsel’s half-baked attempt to investigate the
    whole jury based on a different juror’s apparently biased conduct favored determining that
    Williams had been diligent. See Michael Williams, 529 U.S. at 442.
    The Cunningham III court also reasoned that Cunningham’s raising his first juror-bias
    claim shows that he was not unavoidably prevented from discovering the facts of his second
    juror-bias claim. Cunningham III, 65 N.E.3d at 314. On the contrary, the Michael Williams
    Court concluded that “[d]iligence will require in the usual case that the prisoner, at a minimum,
    seek an evidentiary hearing in state court in the manner prescribed by state law.” 529 U.S. at
    437.
    The Cunningham III court, moreover, reasoned that Cunningham should have discovered
    the connection between Mikesell and the victims’ families because the investigator could have
    and did interview Mikesell, Freeman, and Wobler. Cunningham III, 65 N.E.3d at 314. For a
    § 2254(e)(2) analysis, however, “[t]he question is not whether the facts could have been
    discovered but instead whether the prisoner was diligent in his efforts.” Michael Williams,
    529 U.S. at 435. Here, the investigator tried to interview every juror and thoroughly grilled
    seven of them, including Mikesell, Freeman, and Wobler. Clearly, the state-law “unavoidably
    prevented” inquiry is wholly distinct from the federal-law diligence assessment.
    Nos. 11-3005/20-3429                        Cunningham v. Shoop                                           Page 24
    Finally, Cunningham’s diligence excuses any procedural default. The Michael Williams
    Court explained that its analysis of Williams’s diligence “should suffice to establish cause for
    any procedural default petitioner may have committed in not presenting these claims to the
    Virginia courts in the first instance.” Id. at 444. Because, as we have explained, the facts of this
    case are on all fours with Michael Williams, Cunningham’s diligence likewise demonstrated
    cause. And Cunningham has made a colorable claim that Mikesell was biased by a pre-existing
    relationship with the victims’ families, and that her bias prejudiced him, requiring a § 2254(e)(2)
    hearing. Because cause and prejudice excuses any default, and we again cannot say at this point
    whether Mikesell was actually biased and Cunningham’s Sixth Amendment rights were violated,
    the federal courts may hold an evidentiary hearing under § 2254(e)(2).7
    The dissent argues that Cunningham relies improperly on evidence—Freeman’s and
    Wobler’s testimony about Mikesell’s statements during deliberations—that would be
    7The   district court’s error arose from a misunderstanding of the relationship between diligence and
    procedural default. The district court reasoned that a diligence analysis under § 2254(e)(2) is “not relevant” to a
    procedural-default analysis and that the state courts are the final arbiters of when an imprisoned person can obtain an
    evidentiary hearing in the state courts. Cunningham, 
    2019 WL 6897003
    , at *11. Because Cunningham had
    procedurally defaulted his second juror-bias claim, the district court deemed Cunningham’s diligence to be
    irrelevant. See 
    id.
     The district court further found that any diligence on Cunningham’s part could not constitute
    cause to excuse his procedural default, reasoning that the Michael Williams Court’s “discussion of the procedural
    default of the petitioner’s juror-bias claims is dicta, and the circumstances under which the court found cause for the
    default are easily distinguished.” Id. at *13. “Here, unlike in Williams, Cunningham was able to return to state
    court with his newly developed claim, and the state courts found that under Ohio law and court rules, he was not
    unavoidably prevented from discovering, or reasonably diligent in attempting to discover, the factual basis of his
    claim sooner.” Id.
    We conclude that the district court was wrong. True, we usually cannot upset Ohio courts’ procedural
    determinations, nor can we dictate Ohio’s rules for conducting evidentiary hearings. See Hutchison, 
    744 F.2d at 46
    .
    But § 2254(e)(2) governs the ability of the federal courts—not the state courts—to hold an evidentiary hearing. See
    Michael Williams, 529 U.S. at 437. As Michael Williams makes clear, diligence can excuse a procedural default.
    The district court’s interpretation of the interplay between procedural default and diligence erases the plain text of
    § 2254(e)(2) and ignores Michael Williams and Pinholster. And Michael Williams’s discussion of procedural
    default was not dicta by any measure of what dicta means. If Williams’s diligence failed to excuse his procedural
    default, Williams could not have received an evidentiary hearing in any court. Put another way, whether diligence
    can excuse a procedural default was necessary to the outcome of Williams’s case. See Dictum, BLACK’S LAW
    DICTIONARY (11th ed. 2019). Even if this were dicta, Supreme Court dicta is persuasive and cannot be ignored by
    lower courts for no good reason. See ACLU of Kentucky v. McCreary County, 
    607 F.3d 439
    , 447–48 (6th Cir.
    2010). Finally, the district court erroneously found that no cause exists in Cunningham’s case. The issue is not
    whether Cunningham could have returned to the state courts but whether it was futile for Cunningham to have
    returned. Again, Cunningham III eradicated any ambiguity: Ohio law does not allow Cunningham to litigate his
    unadjudicated juror-bias claim in the state courts. And, as we have already explained, the Ohio court’s state-law
    “unavoidably prevented” analysis is distinct from our federal-law diligence determination.
    Nos. 11-3005/20-3429                        Cunningham v. Shoop                                           Page 25
    inadmissible under Federal Rule of Evidence 606(b) as “an inquiry into the validity of a verdict
    or indictment.”8 Dissent Op. at 57–62. It is unclear whether the dissent faults Cunningham for
    relying on juror testimony to establish prejudice sufficient to excuse his procedural default or to
    meet the requisite showing to obtain a § 2254(e)(2) hearing. In either case, Cunningham does
    not, and need not, rely on juror testimony.
    First, Cunningham does not need to rely on juror testimony at this stage because a
    § 2254(e)(2) hearing will afford him an opportunity to show prejudice. In Michael Williams, the
    Supreme Court decided that lower courts on remand would be best positioned to decide the
    prejudice issue even though Williams offered only “suspicions” and “vague allegations” of juror
    bias. 529 U.S. at 442, 444. The Court’s reasoning for deferring to lower courts follows logically
    from the inextricable nature of the actual bias and prejudice inquiries. Whether a juror was
    actually biased sufficient to “taint the jury to [the defendant’s] detriment,” see Ewing, 914 F.3d
    at 1031, and whether that bias would have so prejudiced the defendant to change the outcome of
    the trial, see Jones v. Bell, 
    801 F.3d 556
    , 564 (6th Cir. 2015), are closely related. 9 Thus, even if
    a defendant’s allegations are “vague” or not supported by any testimony, a defendant’s
    “reasonable efforts” in uncovering evidence of actual bias give him an opportunity to explore
    both actual bias and prejudice at an evidentiary hearing. Michael Williams, 529 U.S. at 442, 444.
    A § 2254(e)(2) hearing will resolve whether Mikesell was actually biased (and for the reasons
    described below, Cunningham need not rely on juror testimony about trial deliberations to do
    8Federal   Rule of Evidence 606(b) provides:
    (b) During an Inquiry into the Validity of a Verdict or Indictment.
    (1) Prohibited Testimony or Other Evidence. During an inquiry into the validity of a verdict or indictment,
    a juror may not testify about any statement made or incident that occurred during the jury’s deliberations; the effect
    of anything on that juror’s or another juror’s vote; or any juror’s mental processes concerning the verdict or
    indictment. The court may not receive a juror’s affidavit or evidence of a juror’s statement on these matters.
    (2) Exceptions. A juror may testify about whether:
    (A) extraneous prejudicial information was improperly brought to the jury’s attention;
    (B) an outside influence was improperly brought to bear on any juror; or
    (C) a mistake was made in entering the verdict on the verdict form.
    9Also   closely related is the doctrine of harmless error. We have long established that the presence of a
    biased juror is a structural error not subject to harmless-error analysis. See Hughes v. United States, 
    258 F.3d 453
    ,
    463 (6th Cir. 2001).
    Nos. 11-3005/20-3429                       Cunningham v. Shoop                                          Page 26
    so). If Mikesell was actually biased, then Cunningham will likewise establish prejudice to
    excuse his default.
    As for the threshold evidentiary showing needed to obtain a hearing under § 2254(e)(2),
    the dissent misunderstands the nature of Cunningham’s second juror-bias claim. Although we
    have held that a habeas petitioner must conform to Federal Rule of Evidence 606(b) when
    seeking a Remmer hearing based on extraneous influence, see Smith v. Nagy, 
    962 F.3d 192
    , 200
    (6th Cir. 2020), Cunningham’s second juror-bias claim, which involves an alleged undisclosed
    pre-existing relationship with the victims’ families, does not involve allegations of extraneous
    influences.10 We have treated a trial court’s failure to hold a Remmer hearing as a due process
    violation closely related to, but distinct from the underlying question of juror bias in violation of
    the Sixth Amendment right to an impartial jury. See Ewing, 914 F.3d at 1030.
    Cunningham’s second juror-bias claim is thus more akin to Michael Williams and the line
    of cases addressing juror omissions during voir dire. See, e.g., English v. Berghuis, 
    900 F.3d 804
    , 813 (6th Cir. 2018) (applying framework under McDonough Power Equip., Inc. v.
    Greenwood, 
    464 U.S. 548
    , 556 (1984), to determine whether juror bias warrants new trial). But
    even if Cunningham is not able to show that Mikesell was untruthful during voir dire, he is still
    entitled to relief if he is able to show at the § 2254(e)(2) hearing that Mikesell was actually or
    impliedly biased. See McDonough, 
    464 U.S. at
    556–57 (Blackmun, J., concurring) (explaining
    that advent of McDonough test did not foreclose defendant from proving juror bias via a showing
    of actual or implied bias, regardless of truthfulness of juror’s voir dire answers); Zerka v. Green,
    
    49 F.3d 1181
    , 1186 n. 7 (6th Cir. 1995); Gonzales v. Thomas, 
    99 F.3d 978
    , 985–86 (10th Cir.
    1996).
    It would therefore be possible for Cunningham to prove that Mikesell was actually biased
    without relying on juror testimony in violation of Federal Rule of Evidence 606(b).                            For
    10Evidence    supporting Cunningham’s first juror-bias claim—that Mikesell received information about
    Cunningham from her coworkers and from reading his casefile—would clearly constitute “extraneous prejudicial
    information” as defined by Federal Rule of Evidence 606(b)(2)(A) even if it did come in the form of juror testimony
    and would thus be admissible under that rule. See United States v. Davis, 
    177 F.3d 552
    , 556 (6th Cir. 1999) (finding
    extraneous influence where juror’s employee provided juror with information that members of the community were
    discussing juror’s role in the proceedings).
    Nos. 11-3005/20-3429                Cunningham v. Shoop                                Page 27
    example, Cunningham could rely on Mikesell’s testimony or the testimony of a victim’s family
    member to show that Mikesell answered untruthfully “a material question on voir dire” that
    “would have provided a valid basis for a challenge for cause.” English, 900 F.3d at 813 (quoting
    McDonough, 
    464 U.S. at 556
    ). Cunningham could offer evidence to prove, for example, that
    Mikesell’s relationship with the victims’ families caused her to answer dishonestly that she did
    not have any personal knowledge of the facts of the case, R. 194-1 (Trial Tr. at 13–14) (Page ID
    #9181–82), or that working for family services would prevent her from being fair and impartial
    towards Cunningham, R. 194-1 (Trial Tr. at 208–09) (Page ID #9376–77). Or Cunningham
    could elicit testimony to show that the nature of Mikesell’s relationship with the victim
    constituted an “extreme situation[] that would justify a finding of implied bias,” sufficient to
    overturn a verdict. English, 900 F.3d at 816 (quoting Phillips, 
    455 U.S. at 222
     (O’ Connor, J.,
    concurring)). Allowing such an evidentiary proceeding would therefore not be fruitless even if
    Rule 606(b) were faithfully applied during the hearing.
    Whether or not Rule 606(b) bars the testimony of jurors Freeman and Wobler,
    Cunningham does not need to rely on that testimony to be granted an evidentiary hearing under
    § 2254(e)(2). Again, in Michael Williams, the court allowed Williams an evidentiary hearing to
    prove actual bias even though his allegations were “vague,” reasoning that “the vagueness was
    not [Williams’s] fault.” 529 U.S. at 442–43. Cunningham alleged in his 2018 post-conviction
    petition that Mikesell “did not reveal her connection to Cunningham or the victims” and that
    “Mikesell was biased against Cunningham because of a current or future relationship with the
    victims’ families.” R. 188-1 (2018 Postconviction Pet. at 8–9) (Page ID #2835–36). Such
    allegations were even more specific than the “vague allegations” of “irregularities, improprieties
    and omissions . . . with respect to the empaneling [sic] of the jury” Williams alleged. Michael
    Williams, 529 U.S. at 442. Just like Williams, Cunningham attempted to offer more evidence in
    support of his allegations, but his failure to do so was not his fault. As Cunningham noted in his
    2018 post-conviction petition, Cunningham asked Mikesell about her relationship with the
    victims during her deposition, but the district court did not allow Mikesell to answer. R. 188-1
    (2018 Postconviction Pet. at 9) (Page ID #2836); R. 188-1 (Mikesell Dep. at 19–20) (Page ID
    #2917). Cunningham may not be able to rely on juror testimony at the evidentiary hearing, but
    he does not need to do so to be offered an opportunity to prove actual bias. The dissent makes
    Nos. 11-3005/20-3429                  Cunningham v. Shoop                                  Page 28
    some valid points, which will no doubt constrain the parameters of the evidentiary hearing, but
    they have no bearing on Cunnningham’s right to such a hearing.
    ***
    This case is Michael Williams, blow-for-blow. The Ohio courts never adjudicated the
    merits of Cunningham’s claim that the victims’ families were Mikesell’s clients.                 And
    Cunningham diligently sought to develop the factual basis of his second juror-bias claim in the
    Ohio courts. The federal courts may accordingly hold an evidentiary hearing for his second
    juror-bias claim concerning Mikesell’s relationship with the victims’ families under
    § 2254(e)(2).
    4. Remedy
    To recap, Cunningham is entitled to habeas relief for both of his juror-bias claims. When
    we determine in a habeas case that a Remmer hearing is in order, we often grant habeas relief
    unless the State takes steps to conduct a proper evidentiary hearing on juror misconduct within a
    reasonable time. See Ewing, 914 F.3d at 1034; see also Nian, 994 F.3d at 759 (citing Ewing and
    issuing the same remedy). Our customary remedy makes sense for Cunningham’s first juror-bias
    claim. But Cunningham receives relief for his second juror-bias claim under § 2254(e)(2), which
    governs the federal courts—not the state courts. And conducting parallel hearings about the
    same juror in the state and federal courts with the same witnesses makes no sense, depletes
    judicial resources, and wastes everyone’s time.
    We therefore order the federal district court to conduct a Remmer hearing to investigate
    both juror-bias claims. Cunningham is entitled to a “‘meaningful opportunity’ to demonstrate
    jury bias at the Remmer hearings.” Lanier, 988 F.3d at 295 (quoting Herndon, 
    156 F.3d at 637
    ).
    Under Sixth Circuit precedent, Cunningham bears the burden of proving actual or implied bias at
    that hearing. See Zelinka, 
    862 F.2d at 95
    ; Treesh, 
    612 F.3d at 437
    . Because this evidentiary
    hearing will transpire nearly two decades after Cunningham’s trial, we acknowledge that it may
    be complicated to locate jurors and to navigate the jury’s waning memories. See Lanier, 988
    F.3d at 298. “[T]he district court should [be] extra attentive [and] ensur[e] that this belated, post-
    verdict hearing would serve as an adequate forum for investigating juror bias, especially because
    Nos. 11-3005/20-3429                   Cunningham v. Shoop                              Page 29
    the accuracy of the information yielded at Remmer hearings declines over time.” Id. If the
    hearing turns out to be “both constitutionally deficient and practically pointless,” id.,
    Cunningham is free to seek habeas relief again, see Ewing, 914 F.3d at 1033.
    II. ISSUE #3: INEFFECTIVE COUNSEL AT PENALTY PHASE
    Whether Cunningham’s trial counsel ineffectively presented mitigation evidence presents
    a close question. Cunningham is correct: his lawyer’s subpar performance at the penalty phase
    flouted the Constitution. The Ohio Court of Appeals’s decision on this issue did not, however,
    unreasonably apply Supreme Court precedent. We therefore cannot grant Cunningham habeas
    relief for this claim.
    A. Background
    Cunningham’s lawyer presented meager mitigating evidence at the penalty phase. Just
    three witnesses testified on Cunningham’s behalf: his sister Tarra, his mother Betty, and forensic
    psychologist Dr. Daniel Davis.        Relevant here, Tarra and Betty confirmed that Betty beat
    Cunningham; Betty’s partners beat Betty, Cunningham, and his siblings; and Cunningham
    witnessed Betty’s stabbing his stepfather to death. R. 194-2 (Trial Tr. at 29–33, 40–44, 47–48)
    (Page ID #10762–66, 10773–77, 10780–81). The two women, however, offered scant details
    about the abuse.         Defense counsel, for example, asked Tarra if Betty physically abused
    Cunningham, to which Tarra replied “Yes.” Id. at 33 (Page ID #10766). The lawyer posed to
    Tarra no further questions about Betty’s abuse of Cunningham; Tarra said no more. When
    Cunningham’s attorney asked Betty if she had disciplined Cunningham, Betty stated that she had
    only “whip[ped] his butt.” Id. at 47 (Page ID #10780). She denied having used a stick or her
    hand to hit Cunningham before confirming that she had disciplined Cunningham with a belt. Id.
    at 47–48 (Page ID #10780–81). She hedged and denied that Cunningham’s stepfather abused
    her children. Id. at 42 (Page ID #10775). According to Betty, he only whipped her children with
    a belt—“like any normal parent would.” Id. When defense counsel asked if Betty had ever
    attempted suicide, she responded that she had tried to kill herself before she had children. Id. at
    48 (Page ID #10781). Cunningham’s attorney said nothing further. The lawyer did not press
    Betty or Tarra about specific incidents, the nature, or the consistency of Betty’s abuse of
    Nos. 11-3005/20-3429                Cunningham v. Shoop                                 Page 30
    Cunningham. When asked why Cunningham’s life should be spared, Betty mentioned that
    Cunningham visited her at her nursing home. Id. 49–50 (Page ID #1078–83).
    Davis was more specific than Tarra and Betty were. Davis attested that he reviewed
    records from Allen County Children Services. Id. at 58 (Page ID #10791). Citing these records,
    Davis explained that Betty once abandoned her children and moved to Indiana. Id. at 69 (Page
    ID #10802). Cunningham and his siblings were shuttled between Betty, their grandmother,
    children services, and foster homes. Id. at 69–70 (Page ID #10802–03). After the children
    missed school for twelve days, Davis testified, the children’s elementary-school principal visited
    Betty’s house and found the kids by themselves. Id. at 70 (Page ID #10803). Once, Betty told a
    visiting caseworker that she would “blow the caseworker away” should the caseworker return for
    another home visit. Id. Davis affirmed that Cunningham had been physically abused. Id. Davis
    pointed to three incidents of physical abuse described in the children-services agency’s records.
    Id. at 70–71 (Page ID #10803–04). Betty, for example, once beat Cunningham with a switch
    because he stole twenty dollars from her; she bruised his arm and cut his forehead. Id. at 70
    (Page ID #1083). A year later, Betty beat and bruised Cunningham for supposedly taking
    Betty’s money. Id. at 71 (Page ID #10804). Betty later beat and bruised Cunningham with an
    extension cord. Id. Davis mentioned in passing that Betty overdosed on pills once. Id.
    Davis dedicated most of his testimony, however, to classifying Cunningham as
    “antisocial” and “psychopathic.” Id. at 80–81 (Page ID #10813–14). Davis affirmed that
    antisocial persons are at risk of “criminality” and “violence,” “typically lack empathy,” and
    “tend to be highly manipulative”; he averred that Cunningham exhibited an antisocial
    “personality.” Id. at 81–82 (Page ID #10814–15). Davis also diagnosed Cunningham with
    malingering, explaining that Cunningham had feigned illness to avoid responsibility or work. Id.
    at 82–83 (Page ID #10815–16).
    Cunningham’s state postconviction petition asserted that his trial counsel “failed to
    reasonably and competently investigate, prepare and present mitigating evidence” at his
    sentencing phase.    R. 192-4 (2003 Postconviction Pet.) (Page ID #5091).           Raising four
    subclaims, Cunningham asserted that his lawyer should have introduced (1) testimony from
    employees of or records supplied by Allen County Children Services; (2) testimony from a
    Nos. 11-3005/20-3429                       Cunningham v. Shoop                                         Page 31
    caretaker at Betty’s nursing home that Cunningham cared for Betty; (3) the details and results of
    a “voice stress analyzer” lie-detector test that indicate that Cunningham told the police that he
    did not fire his weapon at the crime scene; and (4) testimony from a cultural expert. Id. (Page ID
    #5092, 5095, 5098, 5101). Cunningham attached to his postconviction petition sixty-three pages
    of Allen County Children Services records. R. 192-4 (Children-Servs. Rep. at 1) (Page ID
    #5155). He also affixed Jackson’s investigator’s report, which, as explained in the previous
    section, summarized the investigator’s posttrial interviews of six of Cunningham’s jurors and
    one alternate. R. 192-4 (Investigator Rep.) (Page ID #5122).
    The children-services report does include Tarra’s, Betty’s, and Davis’s anecdotes but also
    contains substantial mitigating information that never surfaced at sentencing. See generally R.
    192-4 (Children-Servs. Rep.) (Page ID #5155–5217). Betty, for example, attested that she had
    tried to kill herself before she had children. The children-services records unveil a bleaker
    picture. When Cunningham was just ten years old, one of Betty’s boyfriends beat Betty, broke
    into the family home, and tried to rape her in front of the children on multiple occasions. Id. at 7,
    48 (Page ID #5161, 5200). Ostensibly to prevent herself from killing her boyfriend, Betty sliced
    her wrists open when her children were at home. Id. at 6–7 (Page ID #5160–61).11 The police
    discovered Betty, wrists slashed, drinking a beer with blood trickling from her arms. Id. at 6
    (Page ID #5160). The children’s bedroom brimmed with mounds of garbage, bottles, cans,
    paper, dirt, dried food, dirty clothes, broken glass, and junk. Id. at 6, 43 (Page ID #5160, 5195).
    The kids had no beds or bedding; cockroaches bit them as they slept on the floor. Id. at 43 (Page
    ID #5195). The children, covered in bug bites, told children services that they competed to
    smash the most cockroaches at night. Id. at 44 (Page ID #5196). The bathroom was smeared
    with filth and blood. Id. at 43 (Page ID #5195). A large, fresh pool of blood dripped from the
    dining-room table onto the floor and chairs. Id. at 43 (Page ID #5195). Broken glass piled in
    one corner of the dining room; garbage concentrated in another. Id. Sitting on the floor,
    11Cunningham     may have been staying with his aunt during the suicide incident. R. 192-4 (Children-Servs.
    Rep. at 42) (Page ID #5194). This traumatic attempted suicide, the state of the family home, and the starvation,
    however, were still pertinent to Cunningham’s case at the penalty phase.
    Nos. 11-3005/20-3429                       Cunningham v. Shoop                                         Page 32
    Jackson—a baby at the time—ate from an open box of garbage and glass. Id. The “very dirty”
    children were caked in dried blood. Id. at 44 (Page ID #5196).
    The kids told the police that they “didn’t eat every day” because Betty spent the little
    money that she had on beer. Id. at 6, 36, 41 (Page ID #5160, 5188, 5193).12 They relayed that
    “they had not eaten since yesterday and that since mommy wanted to kill herself today they
    weren’t going to eat today.” Id. at 43 (Page ID #5195). The children were put in a foster home.
    Id. On the way, a caseworker took the children to a McDonalds, but the children hid their food
    under the caseworker’s car seat. Id. at 44 (Page ID #5196). The children explained that they
    thought the foster family would withhold food when they saw the children eating. Id. The
    timing and violent nature of Betty’s suicide attempt, the children’s witnessing multiple attempted
    rapes, the horrendous state of the family home, and the children’s starvation were never brought
    up during Cunningham’s sentencing.
    At least three specific incidents involving Betty’s beating Cunningham and the extent of
    her physical abuse were never mentioned at sentencing. Once, Cunningham’s school nurse
    discovered that Cunningham smelled “foul,” his hands and clothes were dirty, his hair was
    uncombed, there were “moderate bruises” on his left upper arm, there were “mild bruises” on his
    right upper arm, and “old bruises” on his legs and buttock.                     Id. at 28 (Page ID #5180).
    Cunningham told children services that his mother hit him with a broom. Id. On another
    occasion, Cunningham lost twenty-one dollars of “Boy Scout tickets” at school. Id. at 59 (Page
    ID #5211). Betty beat him with an extension cord. Id. at 58 (Page ID #5210). It is unclear
    whether the extension-cord episode was separate from the Boy Scout tickets incident. On
    another occasion, a bruise-covered Cunningham approached his grandmother and told her that
    the children were left alone. Id. at 58 (Page ID #5210). The grandmother refused to take them
    in; she told Cunningham, “that’s your problem.” Id. Cunningham told children services that he
    was frequently beaten because he was expected to watch his siblings, clean, and cook. Id.
    Cunningham relayed that his mother had recently beaten him and his siblings when she found the
    home in slight disarray. Id. Betty, Cunningham told children services, “is either going to ‘beat
    12Betty used the children’s social security money to pay for her alcohol. R. 192-4 (Children-Servs. Rep. at
    57) (Page ID #5209).
    Nos. 11-3005/20-3429                Cunningham v. Shoop                                Page 33
    me to death or kill me.’” Id. Yet children services refused to place the children in another home,
    instead sending Cunningham back to Betty. Id. at 58–59 (Page ID #5210–11). No one spoke
    about these three beating incidents at sentencing, and no one mentioned that Cunningham’s
    grandmother and children services refused to assist Cunningham and his siblings even though
    Cunningham told them that his mother would beat him to death.
    Although Davis mentioned that Betty threatened to “blow” a caseworker “away,” he
    missed other incidents involving Betty’s threatening caseworkers with violence. Betty once told
    Cunningham’s stepfather to hit a caseworker. Id. at 39 (Page ID #5191). Betty told another
    caseworker that she had a dream about beating that caseworker to death, mimicked said beating,
    and stated that she would kill the caseworker and that she was “going to [the caseworker’s] home
    to get you.” Id. at 55–57 (Page ID #5207–08).
    The report also includes details about Cunningham’s relationship with his siblings that
    were cursorily mentioned but inadequately presented at sentencing. For example, trial counsel
    asked Tarra, “Jeronique do a good job taking care of his sisters and half-brothers?” R. 194-2
    (Trial Tr. at 32) (Page ID #10765). To which Tarra answered, “yes.” Id. Trial counsel did not
    introduce evidence from the report that ten-year-old Cunningham had to “watch the children,
    clean and keep the home clean, and cook on several occasions when Betty is drinking”; that
    Cunningham had to “watch the baby”; and when Cunningham was put in a foster home away
    from his siblings, he was “concerned about his brothers and sisters [] [,] wants to return home to
    take care of them[,] [and] goes over to the home daily to [e]nsure that they have food and are
    OK.” R. 192-4 (Children-Servs. Rep. at 9, 26, 40) (Page ID #5163, 5178, 5192).
    Penalty-phase evidence of Betty’s neglect of the children was similarly limited to Tarra’s
    confirmation that Betty “left the children home” for “a couple of days” and Davis’s affirmation
    that Cunningham “would go from his grandmother to children’s services to maybe home for a
    short period of time[.]” R. 194-2 (Trial Tr. at 32, 69–70) (Page ID #10765, 10802–03). No one
    mentioned the extraordinary frequency with which Cunningham was placed with his
    grandmother, his aunt, and foster families or how traumatizing that was for Cunningham. See
    generally R. 192-4 (Children-Servs. Rep.) (Page ID #5155–5217).           No one mentioned at
    sentencing, moreover, that Betty refused to take Cunningham to counseling after he witnessed
    Nos. 11-3005/20-3429                    Cunningham v. Shoop                                    Page 34
    her killing his stepfather, even though Cunningham repeatedly told children services that the
    stabbing made him scared of Betty. Id. at 26–28 (Page ID #5178–80). Also, Betty repeatedly
    expressed to children services that she did not consider using a belt or a switch to beat children to
    be child abuse. Id. at 29–30 (Page ID #5181–82). This too never came up at sentencing.
    Cunningham’s foster parents noticed that Cunningham “sometimes forgets that he is a younger
    boy,” and the records show that Cunningham had bed-wetting problems. Id. at 31, 41 (Page ID
    #5183, 5193). This, likewise, was never brought up at sentencing. Davis testified that Betty
    once overdosed on pills. But Davis did not mention that it was nine-year-old Cunningham who
    discovered Betty overdosed and unconscious. Id. at 36 (Page ID #5188). Nor did Davis explain
    that after the extension-cord-beating incident, Cunningham appeared “very frightened” of Betty
    and told Betty that “she drank too much and left them alone, and he had to watch all the kids.”
    Id. at 38, 55 (Page ID #5190, 5207).
    In postconviction proceedings, the Ohio Court of Appeals dismissed on the merits
    Cunningham’s claim of ineffective assistance of counsel.               See Cunningham I, 
    2004 WL 2496525
    , at *9–11.13 Cunningham preserved all four subclaims in his federal habeas petition.
    R. 19-8 (Habeas Pet. at 78) (Page ID #157).
    B. Analysis
    To demonstrate ineffective assistance of counsel, a defendant must show that counsel’s
    performance was deficient and prejudicial. See Strickland v. Washington, 
    466 U.S. 668
    , 687,
    691 (1984). We begin by rejecting Cunningham’s second, third, and fourth subclaims, i.e., that
    defense counsel should have introduced testimony from one of Betty’s caretakers (subclaim
    two); the details and results of a lie-detector test (subclaim three); and testimony from a cultural
    expert (subclaim four). First, testimony from a caretaker and evidence about the lie-detector test
    would have been cumulative. Betty testified about how Cunningham cared for her and visited
    her at the nursing home. And, as explained in the following section, the jury had already heard
    13The   Ohio Supreme Court rejected a related argument that Cunningham raised on direct appeal—that
    “[defense] counsel should have made a more ‘powerful plea’ to spare Cunningham’s life” at sentencing.
    Cunningham II, 824 N.E.2d at 526. Cunningham did not raise his powerful-plea argument in this appeal. See
    Appellant’s Br. #1 at 88–89.
    Nos. 11-3005/20-3429                Cunningham v. Shoop                                Page 35
    significant testimony from eyewitnesses and experts at the guilt phase about whether
    Cunningham fired a weapon that night. Second, Cunningham’s habeas petition and appellate
    brief do not articulate how the absence of cultural testimony prejudiced the defense.         See
    Appellant’s Br. #1 at 99–105. Thus, the Ohio Court of Appeals did not unreasonably apply
    Supreme Court caselaw in dismissing these three subclaims on the merits.
    Cunningham’s first subargument—that defense counsel should have investigated,
    prepared, and presented the children-services records—is his only meritorious ground for relief.
    We focus on that subclaim here. We apply § 2254(d)(1) deference to Cunningham I, and we
    may look only at the record before the Ohio Court of Appeals—the sentencing-hearing
    transcript, the children-services records, and Jackson’s investigator’s report. See Pinholster,
    
    563 U.S. at 181
    .
    Cunningham argues that his trial counsel ineffectively failed to introduce the children-
    services records. Appellant’s Br. #1 at 92. The State responds that (1) “trial counsel made a
    strategic decision to have Cunningham’s family members give a real life account of
    Cunningham’s childhood, instead of putting the jury to sleep with a bureaucratic case worker
    going over hundreds of records reading to the jury the minute details of Cunningham’s
    childhood”; and (2) “[t]he Allen County Children Services records are not substantially different,
    neither in strength nor subject matter, than what was testified to at the penalty phase.”
    Appellee’s Br. #1 at 138.
    Ohio’s first argument holds no water. For one, the State describes a false dichotomy.
    A happy medium lies between data dumping and an evidence vacuum: a social worker with the
    Allen County Children Services could have read out or described relevant portions of the
    agency’s records. Our precedent, moreover, counsels against anointing the let’s-not-bore-the-
    jury-with-records approach as a viable penalty-phase strategy. In Johnson v. Bagley, Johnson’s
    defense attorney “obtained a large number of files from the Ohio Department of Human Services
    but apparently never read them.” 
    544 F.3d 592
    , 600 (6th Cir. 2008). Counsel “simply submitted
    them to the jury—unorganized and without knowing whether they hurt Johnson’s strategy or
    helped it.” 
    Id.
     Of course, the opposite occurred here: the jury never saw a single page of the
    children-services records. A closer look at Johnson reveals that Ohio’s health-services records
    Nos. 11-3005/20-3429                 Cunningham v. Shoop                                 Page 36
    showed that Johnson’s grandmother had a lengthy history of abuse and that the State was
    worried about placing the young Johnson in her custody. See 
    id.
     Yet defense counsel’s penalty-
    phase strategy revolved around that grandmother’s testimony. See 
    id.
     at 599–600. Therefore,
    the Johnson court chided that the records should have “tipped [defense counsel] off to a different
    mitigation strategy” and “would have avoided the pitfall of submitting records to the jury that
    directly contradicted their theory that [the grandmother] was a positive force for change in
    [Johnson’s] life.” 
    Id.
     at 600–01.
    So too in Cunningham’s case. Here, Cunningham’s counsel called Betty to the stand and
    elicited from her half-hearted and perfunctory confirmations that she whipped Cunningham with
    a belt and that her partner whipped her children like “normal” parents do. The lawyer did not
    solicit more details about the abuse; he also failed to correct Betty when she lied about the timing
    of her suicide attempt and about how she never hit Cunningham with a stick or her hand.
    Instead, the lawyer prodded Betty to speak about how Cunningham cared for her at her nursing
    home. Like in Johnson, the children-services records here demonstrated Betty’s malevolent
    effect on Cunningham’s childhood. Her weak testimony lacerated the far-more-compelling,
    unintroduced evidence about the monstrous childhood abuse that Cunningham suffered at his
    mother’s hands.      And introducing lengthy excerpts from the records—no matter how
    “bureaucratic”—made far more sense than calling an expert to testify that Cunningham was a
    lying, manipulative, malingering antisocial psychopath. Asking Betty and Davis to recount
    unconvincingly a handful of contextless anecdotes instead of calling a social worker from Allen
    County Children Services to lay out substantial portions of the agency’s records simply cannot
    be written off as strategy.
    Ohio’s second argument—that the children-services records overlapped with the
    testimony that was introduced at the penalty phase—presents a close call.             The Court’s
    ineffective-assistance-of-counsel precedent extends across a spectrum. Habeas petitioners are
    entitled to relief when their trial counsel fails “their obligation to conduct a thorough
    investigation of the defendant’s background[,]” Terry Williams, 529 U.S. at 396, as dictated by
    “reasonable professional judgment,” Wiggins, 
    539 U.S. at 527
    . So, at one pole, the Court has
    granted relief in egregious scenarios involving penalty-phase lawyers failing to investigate any
    Nos. 11-3005/20-3429                  Cunningham v. Shoop                             Page 37
    pertinent records or to interview any relevant witnesses. See, e.g., Porter v. McCollum, 
    558 U.S. 30
    , 39 (2009) (granting relief when defense counsel failed to obtain defendant’s school, medical,
    or military service records and to interview any of defendant’s family); Terry Williams, 529 U.S.
    at 395 (“[Defense counsel] failed to conduct an investigation that would have uncovered
    extensive records graphically describing Williams’ nightmarish childhood[.]”). At the other
    pole, the Court has denied relief when trial counsel conducts a substantial investigation and
    presents significant mitigating evidence. See, e.g., Bobby v. Van Hook, 
    558 U.S. 4
    , 10–13
    (2009). In between the poles are cases in which counsel has conducted some investigation into
    the defendant’s personal background. The Court has issued inconsistent conclusions in those
    cases. Compare Wiggins, 
    539 U.S. at 526
    , with Pinholster, 
    563 U.S. at
    190–94.
    Obviously, this case does not belong at the no-investigation-at-all pole. Cunningham’s
    lawyer, at minimum, interviewed Tarra and Betty. And Davis referred to the children-services
    records in his testimony. But Cunningham’s case does not fit at the substantial-investigation-
    and-significant-presentation pole either. Cunningham’s lawyer introduced mere bare-bones facts
    of Cunningham’s personal background and omitted significant detail and specific episodes of
    abuse. Cunningham’s case is distinguishable from every single case in the Court’s ineffective-
    assistance-of-counsel canon.     So, thanks to murky precedent, whether Cunningham should
    receive habeas relief for this claim is a close question.
    Consider, for example, Van Hook. There, defense counsel spoke nine times with Van
    Hook’s mother, once with both parents together, twice with an aunt, and thrice with a family
    friend; contacted two expert witnesses; reviewed military records; attempted to obtain medical
    records; and considered enlisting a mitigation specialist. See Van Hook, 
    558 U.S. at 9
    . The
    lawyer called eight mitigation witnesses who outlined Van Hook’s traumatic childhood. See 
    id. at 5
    . Van Hook argued that his lawyer should have contacted his stepsister, two uncles, two
    aunts, and a psychiatrist who once treated his mother. See 
    id. at 11
    . The Court concluded that
    defense counsel’s investigation was reasonable in scope, reasoning that “there comes a point at
    which evidence from more distant relatives can reasonably be expected to be only cumulative,
    and the search for it distractive from more important duties.” 
    Id.
     Specifically, only one of Van
    Hook’s uncles and the stepsister arguably would have added “new, relevant information” at the
    Nos. 11-3005/20-3429                   Cunningham v. Shoop                                Page 38
    penalty phase; the uncle would have testified that Van Hook’s mother was temporarily
    committed to a psychiatric ward, and the stepsister would have attested that Van Hook’s father
    frequently hit him and tried to kill his mother. 
    Id. at 12
    . But other witnesses had already
    repeatedly and thoroughly testified to both facts at sentencing. See 
    id.
     Because Van Hook had
    not shown how the uncle’s and stepsister’s “minor additional details” about already introduced
    and thoroughly discussed mitigating evidence “would have made any difference,” the Court
    concluded that Van Hook had failed to demonstrate prejudice. 
    Id.
    Cunningham’s case is not Van Hook.            Like Van Hook’s witnesses, Cunningham’s
    witnesses acknowledged that Cunningham suffered physical abuse, neglect, and exposure to
    violence. But the perfunctory evidence presented at Cunningham’s sentencing was far less
    substantial than the thorough, highly detailed evidence in Van Hook. In Van Hook—
    The trial court learned, for instance, that Van Hook (whose parents were both
    “heavy drinkers”) started drinking as a toddler, began “barhopping” with his
    father at age 9, drank and used drugs regularly with his father from age 11
    forward, and continued abusing drugs and alcohol into adulthood. The court also
    heard that Van Hook grew up in a “‘combat zone’”: He watched his father beat
    his mother weekly, saw him hold her at gun and knifepoint, “observed” episodes
    of “sexual violence” while sleeping in his parents’ bedroom, and was beaten
    himself at least once. It learned that Van Hook, who had “fantasies about killing
    and war” from an early age, was deeply upset when his drug and alcohol abuse
    forced him out of the military, and attempted suicide five times (including a
    month before the murder). And although the experts agreed that Van Hook did
    not suffer from a “mental disease or defect,” the trial court learned that Van
    Hook’s borderline personality disorder and his consumption of drugs and alcohol
    the day of the crime impaired “his ability to refrain from the [crime],” and that his
    “explo[sion]” of “senseless and bizarre brutality” may have resulted from what
    one expert termed a “homosexual panic.”
    
    Id.
     at 10–11 (citations omitted, alterations in original).
    Tarra and Betty, by contrast, merely said “yes” when asked if Cunningham was beaten by
    Betty and her boyfriends and if Cunningham had to care for his siblings. That’s it. No other
    details from the children-services report were provided. Yes, Davis recounted three episodes
    involving Betty’s beating Cunningham and one in which Betty threatened to blow a caseworker
    away. Per Van Hook, evidence in the children-services records about these four incidents might
    be cumulative. But no witness mentioned Betty’s boyfriend attempting to rape her in front of the
    Nos. 11-3005/20-3429                         Cunningham v. Shoop                                           Page 39
    children; the timing of Betty’s traumatic attempted suicide; the disgusting state of the family
    house; that Betty and the foster families starved the children; that Betty’s grandmother and
    children services refused Cunningham’s pleas for help; that Cunningham found Betty when she
    overdosed; that Betty refused to take Cunningham to counseling after she killed his stepfather in
    front of him; or that the traumatized nine-year-old Cunningham wet his bed and forgot his age.
    Such evidence cannot be described as “minor additional details” about information that had
    already been discussed at great length at the penalty phase. Cf. Van Hook, 558 U.S. at 4, 12.
    And, unlike in Van Hook, the failure to introduce the mitigating information in the
    children-services report here was highly prejudicial.                  All six jurors who were interviewed
    posttrial conveyed that Cunningham’s attorney was abysmal during the penalty phase. R. 192-4
    (Investigator Rep.) (Page ID #5122–32).14 Six out of six expressed that the defense’s poor
    performance was tantamount to supplying no mitigating evidence whatsoever. Id. The posttrial
    14
    According to Juror Cheryl Osting—
    [S]he was distressed because the attorneys could not come up with anything at the
    sentencing/mitigation hearing. She also said that the psychologist said that the defendant did not
    suffer from a mental illness but did suffer from a mental disorder at times and was very
    manipulative. All 12 jurors wanted the defense to give them anything which they could use in
    mitigation but the defense did not deliver anything. She remembered that the jurors deliberated
    for 3 hours trying to find a mitigating factor but could not find anything and that the attorneys did
    not give a good defense at the mitigation hearing. . . . [T]he jurors prayed for one factor they could
    have used in mitigation but there was no mitigating factors to be found.
    R. 192-4 (Investigator Rep.) (Page ID #5122–23). Juror Staci Freeman “believe[d] that the defense performed
    poorly at the sentencing hearing[,]” that Tarra was “high on drugs” during her testimony, and that Cunningham’s
    foster families or social workers who knew Cunningham should have testified. Id. (Page ID #5125). She “might
    have been swayed if other professionals who knew [Cunningham] when he was a younger man [testified] and said
    something positive about him, might have swayed her vote for the death penalty to life in prison.” Id. She was
    “upset because the defense did not offer any mitigating factors during the sentencing phase which would indicate to
    her and the rest of the jurors that Jeronique Cunningham had a soul.” Id. (Page ID #5126). Juror Roberta Wobler
    complained that “no one” was “present to testify and corroborate testimony from [Betty] about anything of a
    positive nature in [Cunningham’s] life” and that the jurors were “searching for anything of a mitigating factor[.]”
    Id. (Page ID #5127). To Wobler, “the defense could have significantly improved on their presentation if only they
    would have included corroborating witnesses.” Id. (Page ID #5128). She was “really not in favor of the death
    penalty but because she could find absolutely no mitigating factors regarding Jeronique, she voted for the death
    penalty.” Id. Juror Douglas Upshaw “concluded that the defense did not present any mitigating factors which
    would prevent the defendant from being sentenced to death.” Id. (Page ID #5129). Juror Jeanne Adams “said that at
    the sentencing hearing . . . absolutely nothing was added in mitigation by the defense which would have argued for
    anything less than the death penalty. . . . [T]he defense did not present any defense at the sentencing hearing . . . .
    [T]here really was not any mitigation to work with.” Id. (Page ID #5130). Jury Foreperson Nichole Mikesell stated
    that the “[j]urors made a concerted effort to find at least one mitigating factor but there wasn’t any.” Id. (Page ID
    #5131). “She, and the other jurors, wanted corroboration from other witnesses at the sentencing hearing regarding
    something of a positive aspect regarding Jeronique.” Id.
    Nos. 11-3005/20-3429                Cunningham v. Shoop                               Page 40
    interviews make plain that Cunningham’s penalty-phase case was eviscerated by defense
    counsel’s failure to furnish much-needed detail and corroboration about the extent to which
    Cunningham was abused and about how Cunningham had to look after his siblings. Id.
    In Wiggins, defense counsel had “some information” about Wiggins’s background from
    the presentence investigation report and Baltimore’s social-services department’s records.
    Wiggins, 
    539 U.S. at 527, 524
    . The Court concluded that the scope of investigation was
    unreasonable partially because of the contents of the social-services records. 
    Id. at 525
    . In
    Wiggins, the social-services records revealed that—
    [Wiggins’s] mother was a chronic alcoholic; Wiggins was shuttled from foster
    home to foster home and displayed some emotional difficulties while there; he
    had frequent, lengthy absences from school; and, on at least one occasion, his
    mother left him and his siblings alone for days without food.
    
    Id.
     Yet at sentencing, Wiggins’s counsel merely “told the jury it would ‘hear that Kevin Wiggins
    has had a difficult life[.]’” 
    Id. at 526
     (citation omitted). “At no point did [defense counsel]
    proffer any evidence of [Wiggins’s] life history or family background. 
    Id. at 516
     (emphasis
    added); see also Rompilla v. Beard, 
    545 U.S. 374
    , 381–82, 387 (2005) (concluding that defense
    counsel must obtain records containing information that the State has and will use against
    defendant even when defendant was “actively obstructive” and “sen[t] counsel off on false
    leads” and defense counsel spoke with five members of defendant’s family and three mental-
    health witnesses).
    Cunningham’s case is akin to but not quite Wiggins. The contents of the social-services
    records in Wiggins parallel the revelations in the children-services records in the present case.
    Here, children services thoroughly documented how Betty abused substances; how she starved,
    abandoned, beat, and neglected her children; and the many times Cunningham was placed with
    his grandmother, aunt, and foster homes. Unlike Wiggins’s lawyer, however, Cunningham’s
    counsel introduced some personal history through Tarra’s, Betty’s, and Davis’s testimony, most
    of which overlapped with or, in Davis’s case, was drawn from the children-services records.
    That fact distinguishes Cunningham’s lawyer from Wiggins’s lawyer, who presented no
    mitigating evidence about Wiggins’s background to back up her penalty-phase statement that
    Wiggins had a difficult life.
    Nos. 11-3005/20-3429                 Cunningham v. Shoop                                Page 41
    What does this mean for Cunningham? To us, Cunningham’s trial counsel’s performance
    during the penalty phase was clearly constitutionally deficient and prejudicial. The Ohio Court
    of Appeals nonetheless held that defense counsel did not perform ineffectively. Applying the
    harsh standards of AEDPA as elaborated by the Court, Richter, 
    562 U.S. at 102
    , we cannot say
    that the Ohio Court of Appeals unreasonably applied the Court’s ineffective-assistance-of-
    counsel precedent. We cannot grant Cunningham habeas relief for this claim.
    III. ISSUE #4: INEFFECTIVE COUNSEL AT GUILT PHASE
    Cunningham argues that his trial counsel provided ineffective assistance in failing to
    obtain and present testimony from a ballistics expert. We disagree.
    Because no weapons were recovered from the scene of the crime, see Cunningham I,
    
    2004 WL 2496525
    , at *6, eyewitnesses and experts supplied the sole evidence about who shot
    whom with what. The trial court granted defense counsel funds to hire a ballistics expert.
    R. 194-1 (Trial Tr. at 4–8) (Page ID #8847–51).
    Five survivors of the shooting—Dwight Goodloe, Coron Liles, Loyshane Liles, Tomeaka
    Grant, and James Grant—testified that Cunningham was armed with a revolver, that Jackson
    wielded a semiautomatic, and that both Cunningham and Jackson shot persons. R. 194-2 (Trial
    Tr. at 1027–28, 1052–59, 1121–22, 1129–33, 1143, 1153–54, 1175–76, 1195, 1222–27, 1278–
    88) (Page ID #10216–17, 10241–48, 10317–18, 10325–29, 10339, 10349–50, 10371–72, 10391,
    10418–23, 10482–92). Coron Liles attested that he spat out a bullet a few blocks from the crime
    scene; the bullet was never recovered by law enforcement. Tomeaka Grant swore that a bullet
    remained lodged in her arm; the caliber of that bullet is unknown. Id. at 1133, 1226 (Page ID
    #10329, 10422); Cunningham I, 
    2004 WL 2496525
    , at *8.
    At trial, Ohio called two experts: John Heile, a forensic scientist with Ohio’s Bureau of
    Criminal Investigation and Identification, and Cynthia Beisser, a coroner. Heile testified that all
    the recovered cartridges and most of the recovered bullets were .380 caliber and fired from the
    same pistol. Point 380 caliber casings are typically fired by a semiautomatic—not a revolver.
    R. 194-2 (Trial Tr. at 1066–67, 1071–74) (Page ID #10262–63, 10267–70). A damaged bullet
    and a damaged lead core shared the characteristics of .380 caliber bullets, Heile attested. 
    Id.
     at
    Nos. 11-3005/20-3429                 Cunningham v. Shoop                                Page 42
    1075–76 (Page ID #10271–72). But Heile could not conclusively state that these two nonintact
    bullets were fired from the same weapon as the other recovered bullets. See 
    id.
     Because no
    weapons were located, Heile penned a report that listed the guns that could have fired the
    recovered bullets. Only semiautomatics made the list—no revolvers. 
    Id.
     at 1076–77 (Page ID
    #10272–73). On cross-examination, Heile testified that .380 cartridges could fit into a .38
    caliber revolver but that the revolver would probably not fire. Heile also attested that .380
    cartridges would not fire in a .44 caliber revolver without alterations to the gun. 
    Id.
     at 1082–84
    (Page ID #10278–80).
    Beisser autopsied the two murder victims, Leneshia Williams and Jala Grant, who had
    died of gunshot wounds to the head. 
    Id.
     at 1252–54 (Page ID #10456–58). Based on her
    examination, Beisser could not determine the caliber of the bullets that entered Williams and
    Grant. Id. at 1257 (Page ID #10461). Skin, Beisser explained, is elastic; a hole in skin is not the
    same size as the projectile that penetrates the skin. Id. On cross-examination, Beisser testified
    that a .380 caliber pistol could leave entrance wounds of the size found on the victims but that
    the wounds were also consistent with other different-caliber weapons. Id. at 1265–70 (Page ID
    #10469–74). On redirect and re-cross-examination, Beisser repeatedly testified that .380 and .38
    caliber bullets are the same size. Id. at 1271–72 (Page ID #10475–76).
    Instead of summoning a ballistics expert, defense counsel called gun-shop owner William
    Danny Reiff. Reiff testified that .44 caliber revolvers and bullets are much larger than .380
    caliber pistols and bullets. R. 194-2 (Trial Tr. at 1363–64) (Page ID #10567–68). On cross-
    examination, Reiff testified that .38, .357, .380, and .9 caliber cartridges are the same diameter
    and are indistinguishable to lay persons. Id. at 1366–69 (Page ID #10570–73).
    In his state postconviction petition, Cunningham asserted that his trial counsel
    ineffectively failed to obtain and present testimony from a ballistics expert.       Cunningham
    lambasted Reiff’s rebuttal. To clarify that Cunningham could not have fired a .380 caliber
    cartridge in any of the weapons suggested by Heile, Cunningham asserted, defense counsel
    should have shown the jury a video of .380 caliber cartridges being placed into different caliber
    revolvers and fired. R. 192-4 (2003 Postconviction Pet.) (Page ID #5069–72, 5077–80). The
    Ohio Court of Appeals rejected Cunningham’s assertions on the merits. See Cunningham I,
    Nos. 11-3005/20-3429                 Cunningham v. Shoop                                Page 43
    
    2004 WL 2496525
    , at *6–8. Cunningham restated his claim in his federal habeas petition.
    R. 19-6 (Habeas Pet. at 61–67) (Page ID #129–35); Appellant’s Br. #1 at 128–29.
    According § 2254(d)(1) deference to the Ohio Court of Appeals, we assess whether
    defense counsel performed deficiently and prejudicially. See Strickland, 
    466 U.S. at 687, 691
    .
    Perhaps a ballistics expert would have been more convincing than Reiff had been. But trial
    counsel pushed the theory that Cunningham did not fire any weapon on the night of the murder
    while questioning all three experts.        Indeed, Heile’s and Beisser’s testimony favored
    Cunningham’s theory. Heile conveyed that no evidence indicated that a revolver fired the bullets
    and casings recovered; and Beisser insisted that she could not determine the caliber of the gun
    that caused the victims’ entrance wounds. Multiple eyewitnesses, on the other hand, testified
    that they saw Cunningham shoot persons.           Cunningham does not explain in either his
    postconviction petition or his brief how a ballistics expert’s testimony would have affected the
    evidence elicited at trial or altered the outcome of the case. Without evidence of prejudice, we
    deny relief on Cunningham’s fourth claim.
    IV. ISSUE #5: VOIR DIRE
    We also reject Cunningham’s argument that the trial court improperly constrained
    defense counsel’s latitude to question prospective jurors about their willingness to consider
    specific mitigating factors.
    At trial, the court allowed Cunningham’s lawyer to question members of the venire about
    whether they would automatically vote for the death penalty and whether they were willing to
    consider fairly all mitigating factors, sentencing options, and available evidence. R. 194-1 (Trial
    Tr. at 327–31) (Page ID #9502–06). The trial court, however, barred defense counsel from
    asking the prospective jurors about the type of mitigating factors that they would consider in
    voting against the death penalty. 
    Id.
     at 422–25 (Page ID #9597–600).
    On direct appeal, Cunningham argued that the trial court’s restrictions on questioning
    likely resulted in the seating of a juror who would automatically impose the death penalty. See
    Cunningham II, 824 N.E.2d at 513. The Ohio Supreme Court concluded that defense counsel
    waived this argument “by failing to challenge any seated juror’s views on capital punishment.”
    Nos. 11-3005/20-3429                 Cunningham v. Shoop                                Page 44
    Id. The state high court also rejected Cunningham’s claim as meritless. See id. at 513–14.
    Cunningham reraised this claim in his federal habeas petition. R. 19-3 (Habeas Pet. at 23) (Page
    ID #85).
    Because the Ohio Supreme Court failed to clearly and expressly rely on a procedural bar,
    any procedural default is excused. See Harris v. Reed, 
    489 U.S. 255
    , 263 (1989). Extending
    § 2254(d)(1) deference to the state high court’s merits decision, we reject Cunningham’s
    argument. Trial courts must ensure that jurors will not automatically vote for the death penalty.
    See Morgan v. Illinois, 
    504 U.S. 719
    , 729, 734–36 (1992). Others have argued to this court that
    a trial judge violates this constitutional precept when they prohibit questions about specific
    mitigating factors during voir dire. See Hodges v. Colson, 
    727 F.3d 517
    , 528–29 (6th Cir. 2013);
    Bedford v. Collins, 
    567 F.3d 225
    , 232–33 (6th Cir. 2009); Dennis v. Mitchell, 
    354 F.3d 511
    ,
    523–25 (6th Cir. 2003). Just as we rejected that argument in those habeas cases, we do not grant
    relief to Cunningham here.
    V. ISSUE #6: JURY INSTRUCTIONS
    Cunningham has procedurally defaulted his argument that the trial court neglected to
    instruct the jury that it must determine Cunningham’s personal culpability before imposing a
    death sentence. We cannot review this claim.
    Under Ohio Supreme Court Rule of Practice 11.06(A), capital defendants may apply to
    reopen their case within ninety days of the Ohio Supreme Court’s issuance of a mandate. Those
    who show good cause are exempted from the ninety-day deadline. See OHIO S. CT. PRAC. R.
    11.06(A).
    In his 2006 federal habeas petition, Cunningham asserted for the first time that the trial
    court violated the Apprendi v. New Jersey, 
    530 U.S. 466
     (2000), line of cases by failing to
    instruct the jury that Cunningham must possess the requisite personal responsibility to be eligible
    for the death penalty. R. 19-10 (Habeas Pet. at 123, 144–45) (Page ID #190, 211–12). On April
    23, 2007—as federal habeas proceedings unfolded—the Ohio Supreme Court appointed counsel
    to apply to reopen Cunningham’s case under Rule 11.06(A). See R. 51 (1/11/07 Mot.) (Page ID
    #644); R. 55 (2/8/07 Order at 1–2) (Page ID #738–39); R. 59-1 (Reopen App.) (Page ID #749).
    Nos. 11-3005/20-3429                        Cunningham v. Shoop                                          Page 45
    Cunningham reasserted that the jury instructions violated Apprendi and its progeny. R. 59-1
    (Reopen App.) (Page ID #866–69). Cunningham conceded that he had surpassed the ninety-day
    deadline, but he argued that his applying to reopen his case within ninety days of appointment of
    counsel satisfied good cause. Id. at 2 (Page ID #750); Appellant’s Br. #1 at 44. In a single-
    sentence order, the Ohio Supreme Court rejected Cunningham’s application, reasoning that
    Cunningham failed to comply with the rule’s ninety-day filing deadline. The state high court
    said nothing about good cause. State v. Cunningham, 
    872 N.E.2d 946
     (Ohio 2007) (Table).
    Cunningham has procedurally defaulted this claim.                     The Ohio courts have firmly
    established the meaning of “good cause” and regularly follow the ninety-day deadline.
    Wogenstahl v. Mitchell, 
    668 F.3d 307
    , 322 (6th Cir. 2012).15 Thus, Rule 11.06(A) constitutes an
    independent and adequate state ground for procedural default, which the Ohio Supreme Court
    enforced in this case. See Maupin v. Smith, 
    785 F.2d 135
    , 138 (6th Cir. 1986). Cunningham
    correctly points out that postconviction counsel’s ineffective performance can establish cause to
    excuse a procedural default in certain circumstances. See Appellant’s Br. #1 at 48; Martinez v.
    Ryan, 
    566 U.S. 1
    , 13–14 (2012); Trevino v. Thaler, 
    569 U.S. 413
    , 417 (2013). But Cunningham
    has not explained why his postconviction counsel was deficient or prejudicial. See Appellant’s
    Br. #1 at 49. We have nothing to base an ineffective-counsel decision on. To that end, we
    cannot excuse Cunningham’s procedural default, and we cannot review this claim.
    VI. ISSUE #7: BRADY
    Cunningham argues that Ohio violated Brady by failing timely to turn over police
    interviews of two testifying witnesses. We conclude that this claim is partially procedurally
    defaulted and partially meritless.
    At trial, eyewitnesses Dwight Goodloe and James Grant testified.                        Defense counsel
    moved the trial court to review in camera a police report summarizing an interview with
    15Wogenstahl   addresses Ohio Rule of Appellate Procedure 26(B), not Rule 11.06(A). See Wogenstahl, 668
    F.3d at 322. Rule 26(B) governs applications to reopen filed by defendants in all criminal cases, not just defendants
    in death-penalty cases. See OHIO APP. R. 26(B). The provisions are otherwise identical; they include the same
    ninety-day limit. Compare id., with OHIO S. CT. PRAC. R. 11.06(A). We therefore apply Wogenstahl’s analysis to
    this case.
    Nos. 11-3005/20-3429                 Cunningham v. Shoop                                Page 46
    Goodloe, R. 192-4 (Goodloe Rep.) (Page ID #5295–97), and two police reports memorializing
    interviews with Grant, id. (Grant Reps.) (Page ID #5140–50). Finding that Goodloe had testified
    consistently with his interview, the trial court did not supply the Goodloe report to defense
    counsel. R. 194-2 (Trial Tr. at 1037) (Page ID #10226). The trial court, however, found
    sufficient differences between Grant’s testimony and his interviews and allowed the defense to
    use the reports during cross-examination. Id. at 1296 (Page ID #10500). Defense counsel,
    however, never mentioned the Grant reports during cross. Id. at 1298–305 (Page ID #10502–
    09).
    In his state postconviction petition, Cunningham cited Brady in two claims for relief; he
    assailed Ohio for failing to turn over the Goodloe and Grant reports ahead of trial. Cunningham
    explained that defense counsel could have used the interviews to impeach or undermine Goodloe
    and Grant. R. 192-4 (2003 Postconviction Pet.) (Page ID #5072–74, 5083–85). The Ohio Court
    of Appeals concluded that res judicata prevented it from reviewing Cunningham’s Brady
    arguments. See Cunningham, 
    2004 WL 2496525
    , at *12. The state appellate court reasoned that
    these Brady subclaims could have been fairly determined within the confines of the trial record
    and thus should have been raised on direct appeal. See 
    id.
     Alternatively, the Ohio Court of
    Appeals concluded, the Brady claims were meritless. See 
    id.
     at *11–12. Cunningham preserved
    his two Brady subclaims in his federal habeas petition. R. 19-5 (Habeas Pet. at 53) (Page ID
    #100).
    In his postconviction petition, Cunningham supplied two attachments for his argument
    that the State improperly withheld the Goodloe report—the report itself and Goodloe’s testimony
    at trial.   R. 192-4 (2003 Postconviction Pet.) (Page ID #5074, 5109, 5135–36, 5295–97).
    Because this subclaim was based solely on the trial record, the Ohio Court of Appeals correctly
    invoked res judicata in refusing to hear this subclaim. See Hill v. Mitchell, 
    400 F.3d 308
    , 314
    (6th Cir. 2005).
    We reach a different conclusion for the Grant subclaim.         To support this claim,
    Cunningham attached to his postconviction petition the two Grant reports and Grant’s testimony
    at trial. These, of course, were part of the trial record. R. 192-4 (2003 Postconviction Pet.)
    (Page ID #5085, 5109, 5140–50). But Cunningham also attached Jackson’s investigator’s report,
    Nos. 11-3005/20-3429                Cunningham v. Shoop                                Page 47
    which, again, was generated posttrial. That report laid out postverdict interviews with six jurors
    and an alternate, several of whom stated that Grant’s testimony swayed them to convict. 
    Id.
    (Page ID #5085, 5109, 5121–32; 5140–50). Because Cunningham relied on evidence outside the
    trial record for this subclaim, the Ohio Court of Appeals incorrectly invoked res judicata in
    refusing to consider Cunningham’s assertion about the Grant reports. We may therefore review
    the merits of this subclaim. See Hill, 
    400 F.3d at 314
    . We apply § 2254(d)(1) deference to the
    Ohio Court of Appeals’s merits decision.
    The State violates the Constitution when it withholds evidence favorable to a defendant
    that is material to his guilt or punishment. See Brady, 
    373 U.S. at 87
    ; see also United States v.
    Bencs, 
    28 F.3d 555
    , 561 (6th Cir. 1994). A delay in turning over evidence contravenes Brady
    only if the delay itself is prejudicial. See Bencs, 
    28 F.3d at 561
    . Here, the prosecution did
    produce the Grant reports; any prejudice arose from the timing of the handover. Even though
    defense counsel may have been better prepared to cross-examine Grant had the reports been
    turned over before (rather than during) trial, Cunningham’s lawyer failed to request a
    continuance to review the reports. Cf. Joseph v. Coyle, 
    469 F.3d 441
    , 472 (6th Cir. 2006).
    Indeed, when the trial court asked defense counsel if he was ready to cross-examine Grant, the
    lawyer answered in the affirmative. R. 194-2 (Trial Tr. at 1296) (Page ID #10500). Given these
    circumstances, we cannot conclude that the delay prejudiced Cunningham.
    VII. ISSUE #8: PROSECUTOR’S STATEMENTS
    Cunningham argues that the prosecutor made five improper statements. Cunningham
    defaulted his claims about three of the statements, so we cannot consider them. The Ohio
    Supreme Court’s decision about the remaining two statements, moreover, involved no
    unreasonable application of Supreme Court precedent.        We thus reject Cunningham’s final
    argument.
    Cunningham takes issue with five of the prosecutor’s statements—three from the
    prosecutor’s closing argument at the guilt phase and two from his closing argument at the
    sentencing phase. The first statement arose from a back-and-forth about bullets at the closing of
    the guilt phase. Defense counsel conveyed that the physical evidence showed that just one gun
    Nos. 11-3005/20-3429                 Cunningham v. Shoop                                 Page 48
    was used and that Jackson—not Cunningham—fired that weapon. R. 194-2 (Trial Tr. at 1440)
    (Page ID #10650). The prosecutor responded by speculating that Cunningham could have fired
    bullets that were lost in the blood at the crime scene or disintegrated when they hit a wall. 
    Id.
     at
    1441–43 (Page ID #10651–53). Second, the prosecutor stated during the guilt phase that Grant,
    the three-year-old murder victim, never received a chance for justice. Id. at 1448 (Page ID
    #10658). Third, the prosecutor commented at the guilt phase that the killings were “absolutely
    the most cold-blooded calculated inhumane murder that anyone could ever imagine.” Id. at 1449
    (Page ID #10658).      Fourth, the prosecutor mentioned that Cunningham made an unsworn
    statement during the penalty phase that was not subject to cross-examination, which did not
    “lessen his moral culpability” or “diminish the appropriateness of the death sentence.” Id. at 116
    (Page ID #10849). Fifth, the prosecutor conveyed during the penalty phase that Cunningham’s
    unsworn statement; malingering, antisocial-personality, and psychopathic-personality diagnoses;
    comprehension of right and wrong; and lack of progress in treatment should not mitigate
    Cunningham’s sentence.       Id. at 116–17 (Page ID #10849–50).        Cunningham frames these
    statements as the prosecutor’s impermissibly listing out nonstatutory aggravating factors. See
    Appellant’s Br. #1 at 85.
    Cunningham argued on direct appeal that these five statements were improper.
    Highlighting that Cunningham’s trial counsel had objected at trial to the third and fourth
    statements but not to the first, second, and fifth statements, the Ohio Supreme Court reviewed for
    plain error the latter trio of comments. The state high court rejected Cunningham’s argument on
    the merits, concluding that none of the five statements were improper. Cunningham II, 824
    N.E.2d at 523–24. Cunningham preserved all five subarguments in his federal habeas petition.
    R. 19-7 (Habeas Pet. at 68) (Page ID #111).
    We cannot review the first, second, and fifth statements because they have been
    procedurally defaulted. The Ohio courts’ enforcement of the contemporaneous-objection rule is
    an independent and adequate ground that bars habeas relief. See Hand v. Houk, 
    871 F.3d 390
    ,
    417 (6th Cir. 2017).        That the Ohio Supreme Court reviewed the merits of three of
    Cunningham’s allegations for plain error does not waive Ohio’s procedural-default rules. See 
    id.
    So we cannot review these three statements unless the default is excused. See 
    id.
    Nos. 11-3005/20-3429                 Cunningham v. Shoop                              Page 49
    Cunningham argues that his trial counsel’s ineffective performance served as cause and
    prejudice to excuse his defaulting this trifecta of statements. Appellant’s Br. #1 at 85–86. But
    Cunningham has not established prejudice.      The first statement—the speculation about the
    unfound bullets—was not prejudicial. The jury heard that one bullet was dug out of a wall and a
    bullet fragment was discovered in a pool of blood. R. 194-2 (Trial Tr. at 966–71) (Page ID
    #10155–60). A police officer also testified that law enforcement recovered a tooth and jewelry
    while fishing through pools of blood with a pen. 
    Id.
     at 957–58 (Page ID #10146–47). Again,
    Coron Liles spat out an unrecovered bullet in the streets; another bullet remains lodged in
    Tomeaka Grant’s arm. Id. at 1133, 1226 (Page ID #10329, 10422); Cunningham I, 
    2004 WL 2496525
    , at *8. Put another way, other evidence indicated that bullets fired from Cunningham’s
    weapon may have fragmented, been overlooked in blood pools, or otherwise been lost. So the
    prosecutor’s speculations were not prejudicial. No doubt, the prosecutor’s second statement—
    that Grant never received a chance at justice—wrongfully inflamed the passions and prejudices
    of the jury. See Wogenstahl, 668 F.3d at 333. But this comment was isolated and therefore
    harmless. See id. at 333–34. As for Cunningham’s fifth allegation, we are not convinced that
    the prosecutor’s description of the mitigating evidence constituted a list of nonstatutory
    aggravating factors.    Either way, the Constitution allows juries to consider nonstatutory
    aggravating factors. See LaMar v. Houk, 
    798 F.3d 405
    , 431 (6th Cir. 2015). Because this troika
    of statements did not prejudice Cunningham, his procedural default is unexcused. We cannot
    address the merits of these claims.
    We can, however, review the merits of the two nondefaulted subclaims; we apply
    § 2254(d)(1) deference to the Ohio Supreme Court’s consideration of the prosecutor’s third and
    fourth statements. The prosecutor’s third statement—that this was “absolutely the most cold-
    blooded calculated inhumane murder that anyone could ever imagine,” R. 194-2 (Trial Tr. at
    1449) (Page ID #10658)—was improperly designed to inflame the jury’s passion, see Gumm v.
    Mitchell, 
    775 F.3d 345
    , 377 (6th Cir. 2014). If we were directly reviewing Cunningham’s case,
    he may be entitled to relief. See 
    id.
     But this is a habeas case. To attain habeas relief,
    Cunningham must show that the prosecutor’s statements were “so pronounced and persistent that
    it permeates the entire atmosphere of the trial or so gross as probably to prejudice the
    defendant”—a high standard to surpass. Hartman v. Bagley, 
    492 F.3d 347
    , 367 (6th Cir. 2007)
    Nos. 11-3005/20-3429                 Cunningham v. Shoop                                 Page 50
    (quoting Simpson v. Jones, 
    238 F.3d 399
    , 409 (6th Cir. 2000)). In deciding that the third
    statement was harmless, the Ohio Supreme Court did not unreasonably apply Supreme Court
    precedent.
    The prosecutor’s fourth statement—that Cunningham testified sans oath—violated Ohio
    law. See Bedford v. Collins, 
    567 F.3d 225
    , 236 (6th Cir. 2009) (explaining that Ohio law
    provides that the prosecution may not disparage a defendant’s decision not to testify under oath).
    But the Supreme Court has never addressed whether the Constitution is implicated when a state-
    law right to supply unsworn testimony is violated. Absent such precedent, the Ohio Supreme
    Court’s single-sentence postcard denial—“[w]e reject this argument,” Cunningham II,
    824 N.E.2d at 524—involved no unreasonable application of Supreme Court caselaw.              See
    Richter, 
    562 U.S. at 98
     (“Where a state court’s decision is unaccompanied by an explanation, the
    habeas petitioner’s burden still must be met by showing there was no reasonable basis for the
    state court to deny relief.”).
    In short, Cunningham’s argument that the prosecutor made improper statements is
    partially defaulted and partially meritless. We thus reject this argument.
    VIII. CONCLUSION
    We REVERSE and REMAND so that the district court can conduct an evidentiary
    hearing to investigate Cunningham’s two juror-bias claims consistent with this opinion.
    Nos. 11-3005/20-3429                Cunningham v. Shoop                                Page 51
    _______________________________________________________________________
    CONCURRING IN THE JUDGMENT IN PART AND DISSENTING IN PART
    _______________________________________________________________________
    KETHLEDGE, Circuit Judge, concurring in the judgment in part and dissenting in part.
    What the majority calls “the harsh standards of AEDPA as elaborated by the [Supreme] Court,”
    Op. at 41, are standards that bind us nonetheless. Here, the majority orders habeas relief based
    on our own precedents, rather than those of the Supreme Court—an error for which the Court has
    already reversed us more than once. The majority also orders the district court to conduct an
    evidentiary hearing on the basis of post-trial testimony about jury deliberations—which Federal
    Rule of Evidence 606(b) presumptively bars a federal court from even “receiv[ing.]” As to those
    holdings, I respectfully dissent.
    I.
    The background facts deserve mention here. During the afternoon of January 3, 2002,
    Cunningham bought crack cocaine from Shane Liles at Liles’s apartment in Lima, Ohio. That
    evening, Cunningham and Cleveland Jackson—armed with a revolver and pistol, respectively—
    returned to Liles’s apartment to rob him. When they arrived, Liles was not home; instead, they
    found several of his friends and family members. Liles’s girlfriend, Tomeaka Grant, called Liles
    to tell him he had visitors. Cunningham and Jackson waited for Liles in the living room, where
    teenagers Leneshia Williams, Coron Liles, and Dwight Goodloe Jr. were talking and watching
    “The Fast and the Furious.” Tomeaka Grant returned to the kitchen, where she had been playing
    cards with her brother, James Grant, and a family friend, Armetta Robinson. Grant had stopped
    by with his three-year-old daughter Jala to pick up a vacuum cleaner.
    Shane Liles soon arrived home, and Cunningham told him that Jackson wanted to
    purchase drugs. Liles and Jackson discussed the sale on the staircase near the living room, while
    Cunningham remained on the couch with the teens. Then Cunningham stood up and ordered the
    teens into the kitchen. When Coron hesitated, Cunningham struck him in the face with the barrel
    of his gun, breaking Coron’s jaw. Coron ran into the kitchen crying; Cunningham followed,
    rounding up the other two teens and forcing them at gunpoint into the kitchen, where they joined
    Nos. 11-3005/20-3429                Cunningham v. Shoop                               Page 52
    Tomeaka, James, and Jala Grant, along with Armetta Robinson. The group tried to shield
    themselves with a table, but Cunningham pushed it away and locked the back door.
    Meanwhile, Jackson pulled a gun on Shane Liles and walked him upstairs, demanding
    drugs and money. Jackson then tied Liles’s hands behind his back and forced him into the
    kitchen, where the rest of the group was huddled, crying and pleading. James Grant held his
    daughter, three-year-old Jala, in his lap. Jackson and Cunningham demanded that everyone
    place any valuables on the table; when Shane Liles said he had none left, Jackson shot him in the
    back. Almost immediately, Cunningham and Jackson started firing into the rest of the group—
    “aiming towards like the middle, at the ends and coming in . . . one from one side, one from the
    other.” The victims saw smoke and sparks from Cunningham’s gun and heard the “click, click,
    click” of empty weapons as Jackson and Cunningham continued to pull the triggers, even after
    they were out of bullets.
    Every member of the group was shot. Seventeen-year-old Leneshia Williams was shot in
    the back of her head, killing her almost instantly. Goodloe saw Coron’s head “snap back” when
    Cunningham shot him in the mouth. Armetta Robinson was shot in the back of her head and
    comatose for 47 days. Tomeaka Grant was shot in the head and arm and lost her left eye. James
    Grant was shot five times, including in his face, as he tried to shield Jala. His efforts were
    unsuccessful: Jala was shot twice in the head and died on the kitchen floor. Cunningham and
    Jackson fled and discarded the murder weapons, which were never recovered.
    *     *    *
    As a juror in Cunningham’s trial, Nichole Mikesell heard detailed testimony regarding
    the facts described above—including testimony by James Grant about how he begged for his
    daughter’s life before she was shot. The jury convicted Cunningham and recommended a
    sentence of death, which the trial judge imposed.
    Nos. 11-3005/20-3429                   Cunningham v. Shoop                               Page 53
    II.
    A.
    One weekend afternoon about a year after the trial, investigator Gary Ericson showed up
    uninvited at Mikesell’s home while she was playing outside with her kids. Ericson’s summary of
    that interview is the basis of Cunningham’s first claim of juror bias, on which the majority now
    grants relief.
    That claim, as the majority describes it, is that “Mikesell’s social-worker colleagues fed
    her information about Cunningham.” Op. at 12. That description substantially embellishes what
    the summary itself says. As an initial matter, the majority asserts that Mikesell’s “statement” to
    Ericson “indicated bias against Cunningham.” Op. at 17. But of course it did: the interview
    came a year after Mikesell had heard chapter and verse about how Cunningham rounded up and
    then helped to shoot eight people in Shane Liles’s kitchen. By then—after Mikesell and every
    other juror had voted to convict Cunningham and recommended a sentence of death—it was
    Mikesell’s prerogative to think that Cunningham was “an evil person” with “no redeeming
    qualities.” Jurors must be impartial before they render a verdict, not after.
    The only assertion in Ericson’s summary that matters—as the state court of appeals
    correctly observed—was his assertion that Mikesell had said that “some social workers worked
    with Jeronique in the past and were afraid of him.” That assertion was not enough, the state
    court held, to require the trial court to hold an evidentiary hearing as to whether Mikesell had
    been an impartial juror the year before. The question now is whether that decision “was so
    lacking in justification that there was an error well understood and comprehended in existing law
    beyond any possibility for fairminded disagreement.” Harrington v. Richter, 
    562 U.S. 86
    , 103
    (2011).
    The answer to that question depends on the showing necessary to mandate—as a matter
    of constitutional due process—an evidentiary hearing regarding a juror’s partiality. On habeas
    review, we determine that answer only by reference to “clearly established Federal law, as
    determined by the Supreme Court of the United States[.]” 
    28 U.S.C. § 2254
    (d). Here, the
    relevant Supreme Court case is Remmer v. United States, 
    347 U.S. 227
     (1954), in which a juror
    Nos. 11-3005/20-3429                 Cunningham v. Shoop                                Page 54
    alleged mid-trial that he had been offered a bribe to acquit the defendant. That allegation,
    coupled with an FBI agent’s follow-up visit to the juror while the trial was still underway,
    mandated an evidentiary “hearing with all interested parties permitted to participate.” 
    Id. at 230
    .
    The majority thinks this case is so obviously similar to Remmer that the state court’s decision not
    to hold an evidentiary hearing was “an unreasonable application of Remmer.” Op. at 15.
    But the only obvious error here is the majority’s own. The majority says that, “[t]o
    receive a Remmer hearing, Cunningham had to colorably allege that the jury encountered
    extraneous influence—which he did in his state postconviction petition.” Op. at 14 (emphasis
    added). But the rule that the majority applies to this claim—that upon a “colorable” allegation of
    juror bias, the trial court must hold an evidentiary hearing to investigate the matter further—
    appears in no holding “by the Supreme Court of the United States[.]” 
    28 U.S.C. § 2254
    (d).
    Instead that rule comes from our own direct-review cases, notably United States v. Davis, 
    177 F.3d 552
    , 557 (6th Cir. 1999).      And we cannot grant habeas relief based upon our own
    constitutional precedents, which is what the majority does today. For this particular trespass the
    Supreme Court has already reversed us at least twice: “As we explained in correcting an
    identical error by the Sixth Circuit two Terms ago, circuit precedent does not constitute ‘clearly
    established Federal law, as determined by the Supreme Court,’ 
    28 U.S.C. § 2254
    (d)(1). It
    therefore cannot form the basis for habeas relief under AEDPA.” Parker v. Matthews, 
    567 U.S. 37
    , 48-49 (2012) (cleaned up). Thus, the Court held, “it was plain and repetitive error for the
    Sixth Circuit to rely on its own precedents in granting [] habeas relief.” 
    Id. at 49
    . Yet here the
    majority repeats the same error again.
    A lawful resolution of Cunningham’s claim would begin with the Supreme Court’s
    recognition that, “[w]hen assessing whether a state court’s application of federal law is
    unreasonable, the range of reasonable judgment can depend in part on the nature of the relevant
    rule that the state court must apply.” Renico v. Lett, 
    559 U.S. 766
    , 776 (2010) (internal quotation
    marks omitted). Specifically, “the more general the rule at issue—and thus the greater the
    potential for reasoned disagreement among fair-minded judges—the more leeway state courts
    have in reaching outcomes in case-by-case determinations.” 
    Id.
    Nos. 11-3005/20-3429                  Cunningham v. Shoop                                 Page 55
    Under that framework, the Ohio Court of Appeals had maximum leeway when
    adjudicating the claim at issue here. For as to the showing necessary to mandate an evidentiary
    hearing regarding potential juror bias, the Supreme Court’s holdings provided the Ohio court
    with scarcely any guidance at all. In Remmer itself, the Court made no attempt to describe,
    qualitatively or quantitatively, the showing necessary to mandate the evidentiary hearing that the
    majority says was so plainly mandated here. Instead the Court said this: “The trial court should
    not decide and take final action ex parte on information such as was received in this case, but
    should determine the circumstances, the impact thereof on the juror, and whether or not it was
    prejudicial, in a hearing with all interested parties permitted to participate.” 
    347 U.S. at 229-30
    (emphasis added).
    That holding provided not a rule but a data point: the Court said that a hearing was
    necessary on the facts of that case, but did not state a principle of general application as to why.
    The Ohio courts were thus left to compare the facts of this case to the facts of Remmer when
    deciding whether to order a hearing. And a fairminded jurist could easily conclude that the facts
    here were materially different than the facts there. In Remmer, two facts were critical. The first,
    as noted above, was that, during trial, a juror reported to the judge that a third party had offered
    the juror what appeared to have been a bribe to vote in favor of acquittal. That amounted to an
    allegation of “tampering directly or indirectly with a juror during a trial about the matter pending
    before the jury[,]” which, if true, the Court deemed “presumptively prejudicial.” 
    Id. at 229
    . The
    second critical fact was that, after the juror reported the apparent bribe to the judge, an FBI agent
    visited the juror to inquire about it, again while the trial was still pending. 
    Id. at 228
    . As to the
    latter fact, the Court said: “The sending of an F.B.I. agent in the midst of a trial to investigate a
    juror as to his conduct is bound to impress the juror and is very apt to do so unduly.” 
    Id. at 229
    .
    These two facts combined were the “information such as was received in this case” that
    mandated a hearing in Remmer. 
    Id. at 229-230
    .
    We have nothing of the sort for the claim here. What we have, rather, is an allegation
    that, a year after trial, Mikesell knew that some of her colleagues were afraid of Cunningham.
    That allegation, taken as true, is not nearly as prejudicial on its face as the bribery allegation in
    Remmer was. Instead, as the Ohio Court of Appeals recognized, the allegation requires a degree
    Nos. 11-3005/20-3429                Cunningham v. Shoop                               Page 56
    of speculation—about whether Mikesell obtained that putative knowledge in the twelve months
    after trial rather than before, and about the extent to which that knowledge was actually
    prejudicial—that the allegation in Remmer, taken as true, did not. A fairminded jurist could
    therefore conclude that Remmer’s presumption of prejudice did not apply here. Nor does the
    record for this claim include anything like an FBI agent’s mid-trial visit to a juror recently
    offered a bribe to acquit. Thus, a fairminded jurist could conclude—I think likely would
    conclude—that the information received here was less suggestive of prejudice than the
    “information such as was received” in Remmer. 
    Id. at 229-30
    .
    Meanwhile, in the 60-odd years since Remmer, the Supreme Court has not ordered a
    Remmer hearing even once. (The majority’s reliance on Smith v. Phillips, 
    455 U.S. 209
     (1982),
    is misplaced: that case did not even present the question whether to order a Remmer hearing.
    See 
    id. at 217
    .) Thus, as to the Supreme Court’s own precedents, the facts of Remmer itself
    remain the only source of guidance as to the showing necessary to mandate a Remmer hearing.
    And those facts are quite different from those here. No precedent of the Supreme Court,
    therefore, would compel every fairminded jurist to hold that a Remmer hearing was mandatory as
    to Cunningham’s first claim of juror bias. The majority misapplies § 2254(d) when it grants the
    writ as to that claim.
    B.
    The majority likewise orders a hearing as to Cunningham’s second claim of juror bias,
    which the Ohio Court of Appeals held was procedurally barred. We therefore review that claim
    de novo. Coley v. Bagley, 
    706 F.3d 741
    , 749 (6th Cir. 2013).
    As an initial matter, I think that Cunningham has established diligence for purposes of
    seeking an evidentiary hearing (as opposed to substantive relief) on this claim. The claim itself
    centers on allegations that, during deliberations, Mikesell told other jurors that she knew the
    victims’ families. Cunningham first became aware of the grounds for this claim, such as they
    are, when his own investigator interviewed jurors Staci Freeman and Roberta Wobler in late
    2008. Cunningham then sought written discovery and an evidentiary hearing in federal and then
    state court. Under Supreme Court precedent, those efforts are enough to establish Cunningham’s
    Nos. 11-3005/20-3429                 Cunningham v. Shoop                                  Page 57
    diligence for purposes of the habeas statute. See 
    28 U.S.C. § 2254
    (e)(2); Williams v. Taylor,
    
    529 U.S. 420
    , 437 (2000). Those same efforts support a determination of cause (though not
    prejudice) for purposes of his procedural default of this claim. 
    Id. at 444
    .
    That leaves the question whether Cunningham has made the substantive showing
    necessary to obtain a hearing as to this claim. But a threshold question is evidentiary: whether,
    as the district court held, the evidence on which Cunningham based this claim was itself barred
    by the longstanding “rule against admission of jury testimony to impeach a verdict[.]” Tanner v.
    United States, 
    483 U.S. 107
    , 121 (1987). I think the district court was right on this point.
    “[L]ong-recognized and very substantial concerns support the protection of jury
    deliberations from intrusive inquiry.”      
    Id. at 127
    .    As this case itself illustrates, if jury
    deliberations were open to examination upon every post hoc claim of misconduct or bias,
    “[j]urors would be harassed and beset by the defeated party in an effort to secure from them
    evidence of facts which might establish misconduct sufficient to set aside a verdict.” 
    Id. at 120
    .
    Thus, by the early 20th century, “the near-universal and firmly established common-law rule in
    the United States flatly prohibited the admission of juror testimony to impeach a verdict.” 
    Id. at 117
    . That rule is codified today in Federal Rule of Evidence 606(b), which provides in full:
    (1) Prohibited Testimony or Other Evidence. During an inquiry into the validity
    of a verdict or indictment, a juror may not testify about any statement made or
    incident that occurred during the jury’s deliberations; the effect of anything on
    that juror’s or another juror’s vote; or any juror’s mental processes concerning the
    verdict or indictment. The court may not receive a juror’s affidavit or evidence of
    a juror’s statement on these matters.
    (2) Exceptions. A juror may testify about whether:
    (A) extraneous prejudicial information was improperly brought to the jury’s
    attention;
    (B) an outside influence was improperly brought to bear on any juror; or
    (C) a mistake was made in entering the verdict on the verdict form.
    (Emphasis added.)
    The testimony on which Cunningham based his second claim of juror bias ran directly
    into the headwinds of this rule. That testimony took the form of affidavits and deposition
    Nos. 11-3005/20-3429                 Cunningham v. Shoop                                Page 58
    testimony by Roberta Wobler and Staci Freeman, both of whom were jurors at his trial. And
    virtually all that testimony concerned matters within the jury’s deliberations, which means that—
    subject to the exceptions in Rule 606(b)(2)—the district court presumptively could not even
    “receive” these jurors’ “affidavits and evidence[.]” Fed. R. Evid. 606(b)(1) (emphasis added).
    Yet the majority proceeds not only to receive all that evidence but to order a hearing based upon
    it.
    Most of the testimony that the majority cites from these witnesses—e.g., Freeman’s
    testimony that she and “other people in the [jury] room felt pressured[,]” that Mikesell “was very
    domineering[,]” that Freeman “was the last one holding out,” that “I felt the sense in the room,
    I felt the pressure,” Mikesell “tried to steer everyone,” and so on—was patently barred under the
    plain terms of Rule 606(b)(1). That testimony was the archetype of evidence that the Rule
    precludes jurors from offering and courts from receiving. That testimony was pedestrian as well:
    jurors commonly “assert after the fact that other jurors pressured them into their verdict.” United
    States v. Brooks, 
    987 F.3d 593
    , 604 (6th Cir. 2021); see also, e.g., United States v. Lloyd,
    
    462 F.3d 510
    , 519 (6th Cir. 2006) (district court properly declined to receive post-trial testimony
    that a juror “could no longer stand the pressure from other jurors”); United States v. Tallman,
    
    952 F.2d 164
    , 167 (8th Cir. 1991) (“To admit proof of contentiousness and conflict to impeach a
    verdict under Rule 606(b) would be to eviscerate the rule”).
    The only testimony that was even arguably proper under Rule 606(b) concerned
    Mikesell’s putative relationships with the victims’ families—an issue that easily could have been
    covered in voir dire. Wobler testified in her deposition that during “deliberations [Mikesell]
    stated she may in the future be working with the families under the Welfare Job and Family
    Services where she worked.” Freeman testified in her deposition that, during deliberations,
    Mikesell said “she dealt with the victims and their families, they knew who she was, and that if
    she would find him not guilty that she would have to deal with them and that’s just something
    she didn’t want to have to deal with because of who she was.”
    The question, then, is whether this subset of testimony fell within an exception to Rule
    606(b)’s bar on juror testimony concerning statements made during deliberations. The relevant
    Nos. 11-3005/20-3429                  Cunningham v. Shoop                                   Page 59
    exceptions are those in Rule 606(b)(2)(A) and (B)—whose differences the caselaw sometimes
    blurs by conflating them into one.
    Rule     606(b)(2)(A)     concerns   certain    “information”;   Rule 606(b)(2)(B),     certain
    “influences.”     “[E]xtraneous prejudicial information[,]” within the meaning of Rule
    606(b)(2)(A), includes “publicity and information related specifically to the case the jurors are
    meant to decide[.]” Warger v. Shauers, 
    574 U.S. 40
    , 51 (2014) (emphasis added). That kind of
    information bears directly on the facts the jury must find (which one might call “substantive
    extraneous information”) or on the jury’s assessment of a witness’s credibility (which one might
    call “impeachment extraneous information”).           That a juror’s daughter was involved in an
    accident similar to the accident at issue at trial, for example, did not provide that juror with
    “extraneous prejudicial information” within the meaning of the rule—because the prior accident
    “did not provide either her or the rest of the jury with any specific knowledge regarding [the
    defendant’s] collision with [the plaintiff].” Id. at 52. By contrast, “news reports of the case
    being decided by the jurors” would be extraneous prejudicial information under Rule
    606(b)(2)(A). Thompson v. Parker, 
    867 F.3d 641
    , 648 (6th Cir. 2017). So too would a juror’s
    past dealings with a party or witness, which “taints the deliberations with information not subject
    to a trial’s procedural safeguards.” United States v. Herndon, 
    156 F.3d 629
    , 636 (6th Cir. 1998).
    Here, Mikesell’s alleged reference to her past or future relationship with the victim’s families
    conveyed to the jurors no information about the facts of the case or the credibility of the
    witnesses who testified.       That reference therefore did not convey “extraneous prejudicial
    information” to the jury.
    A closer question is whether Mikesell’s alleged past (Freeman’s version) or future
    (Wobler’s version) relationship with the victims’ families was “an outside influence [that] was
    improperly brought to bear on any juror[.]” Fed. R. Evid. 606(b)(2)(B). An outside influence is
    an “external influence” upon the jury, rather than an “internal” one. Tanner, 
    483 U.S. at 117
    .
    This distinction too is more illustrated than defined in the caselaw. Examples of external
    influence include the bribe offer in Remmer; a bailiff’s statement to jurors that the defendant was
    “wicked” and “guilty[,]” see Parker v. Gladden, 
    385 U.S. 363
    , 365 (1966); the mid-trial
    pendency of a juror’s employment application with the district attorney’s office that was trying
    Nos. 11-3005/20-3429                 Cunningham v. Shoop                                Page 60
    the case, see Smith v. Phillips, 
    455 U.S. 209
    , 212 (1982); and “‘a threat to the safety of a member
    of [a juror’s] family,’” see Tanner, 
    483 U.S. at 123
     (quoting H.R.Rep. No. 93-650, pp. 9-10
    (1973)). Examples of influences deemed internal include a juror’s intoxication during trial,
    Tanner, 
    483 U.S. at 125
    ; and a juror’s “own subjective fear” that he might encounter the
    defendant’s family after trial. Garcia v. Andrews, 
    488 F.3d 370
    , 376 (6th Cir. 2007).
    The distinction between external and internal influences is elusive because even internal
    influences ultimately arise from some external cause. (No influence upon a juror is a priori.) In
    Garcia, for example, the juror’s fear was “based on the fact that he worked in the area where the
    Garcia family owned property and that he was ‘in the same business’” that they were in. 
    Id.
    That professional and geographic immediacy was external to the juror’s own mental processes,
    but the “subjective fear” that resulted—and thus the “influence” arising from that fear—was
    internal. Yet in Phillips the pending job application—which the juror himself submitted, and
    whose effect on the juror might have been no different than the “subjective fear” in Garcia—was
    apparently an external influence.
    All these cases involve a chain of causation between external events and an influence that
    is ultimately felt as internal. Perhaps the best way to understand these distinctions, then, is by
    reference to whether the influence’s proximate cause is internal or external to the juror’s mental
    processes. Suppose a juror’s spouse threatens to divorce him if he does not vote to convict in the
    case in which he sits. Any resultant influence on that juror would flow from the threat itself, “in
    a natural and continuous sequence, unbroken by any efficient intervening cause[.]” Black’s Law
    Dictionary 1125 (6th ed. 1990) (defining “proximate cause”). Hence the threat would be an
    external influence. But suppose the juror instead merely believes that his spouse very much
    wants him to vote to convict. A prejudicial influence resulting from that belief would flow more
    from the intervening cause of juror’s own subjective fears than from his spouse’s body language.
    Hence that influence, like the one in Garcia, would be internal. Phillips might be a closer case;
    but there the Court apparently thought that the influence upon the applicant juror flowed more
    naturally and continuously from the pending application than from his antecedent decision to
    submit it. (No application, no influence.) By contrast, in Garcia, the juror’s fear did not flow
    naturally and continuously from the what the juror called the “propensity for contact” with the
    Nos. 11-3005/20-3429                 Cunningham v. Shoop                                 Page 61
    defendant’s family; instead that fear was “subjective,” which is to say its primary cause was
    internal.
    In any event, I think that any influence from Mikesell’s alleged relationship with the
    victim’s families was likewise internal. In our last decision in Cunningham’s case, more than
    seven years ago, our court defined “the real question raised by this claim” as follows: “did
    Mikesell have a relationship with the families of the victims, and if so, was she improperly
    biased or influenced by that relationship and her knowledge that she would have to face them
    and work in the community after the trial was over?” Cunningham v. Hudson, 
    756 F.3d 477
    , 486
    (6th Cir. 2014). Any “fear” that Mikesell had of facing the victim’s families after an acquittal
    was just as “subjective” as the Garcia juror’s fear of facing the defendant’s family after a
    conviction. For in neither case did the families take any discrete action to cause the alleged fear.
    In both cases, rather, the fear was subjective, arising primarily from the juror’s own mental
    processes—in Mikesell’s case (assuming the fear existed at all) from her own self-imposed
    moral pressure.
    The “influence” of which Cunningham complains now was therefore internal. Thus, the
    jurors’ testimony about that alleged influence did not fall within any exception in Rule 606(b)(2),
    which means that Rule 606(b)(1) barred the district court from receiving that testimony.
    The district court therefore was not required to hold a hearing on the basis of that testimony.
    See Tanner, 
    483 U.S. at 126-27
    . (On this point the majority’s reliance on Williams is likewise
    misplaced: the evidence that supported a hearing in that case had nothing to do with jury
    deliberations. See 529 U.S. at 441-43.)
    It bears mention that the omission of any open-ended exception in Rule 606(b)(2) for
    testimony about “potential juror bias” was deliberate. The rule’s exceptions, as shown above,
    are more narrow and discrete.       And Rule 606(b)(1)’s limitations, the Supreme Court has
    repeatedly emphasized, operate alongside “existing, significant safeguards for the defendant’s
    right to an impartial and competent jury beyond post-trial juror testimony[.]” Pena-Rodriguez v.
    Colorado, 
    137 S. Ct. 855
    , 866 (2017). Specifically, “voir dire provides an opportunity for the
    court and counsel to examine members of the venire for impartiality. As a trial proceeds, the
    court, counsel, and court personnel have some opportunity to learn of any juror misconduct.
    Nos. 11-3005/20-3429                  Cunningham v. Shoop                               Page 62
    And, before the verdict, jurors themselves can report misconduct to the court.”          
    Id.
       But
    testimony about jury deliberations cannot serve as a back-end substitute for voir dire. “It is
    virtually impossible to shield jurors from every contact or influence that might theoretically
    affect their vote.” Phillips, 
    455 U.S. at 217
    . And it is far from clear “that the jury system could
    survive such efforts to perfect it.” Tanner, 
    483 U.S. at 120
    . For all these reasons, the majority
    errs in ordering a hearing on this claim.
    C.
    Finally, I concur in the judgment as to the majority’s denial of relief on Cunningham’s
    remaining claims.     I disagree, however, with the majority’s dictum that counsel’s “subpar
    performance at the penalty phase flouted the Constitution.” Op. at 29. The majority does not
    dispute the adequacy of counsel’s investigation, asserting instead that counsel should have
    presented more details from the records of Allen Children’s Services. As the Ohio courts
    determined, however, the evidence that Cunningham (and now the majority) cites “largely
    duplicated the mitigation evidence at trial.” Cullen v. Pinholster, 
    563 U.S. 170
    , 200 (2011).
    And those records “would barely have altered the sentencing profile presented[.]” Strickland v.
    Washington, 
    466 U.S. 668
    , 700 (1984).
    I concur in the judgment in part and respectfully dissent in part.