#2 Braun Strowman
It was reported by PW Insider in November 2018 that Braun Strowman was dealing with backstage heat in WWE due to his bad time-keeping and etiquette in the locker room, with one source describing him as "his own worst enemy and his worst advocate".
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According to the report, those issues are largely the reason why WWE has been reluctant to give the Wyatt Family member the “next step” whenever he receives a push.
At the time that the report was published, “The Monster Among Men” was set to miss the next two months of action due to elbow surgery (with the exception of a short match against Baron Corbin at TLC 2018), so it is difficult to tell how much this supposed heat affected his character in the short-term.
For what it’s worth, upon his return from injury, WWE removed Strowman from his Universal Championship match against Brock Lesnar at the 2019 Royal Rumble, so perhaps there could have been some truth behind the heat reports.