Most of this is stuff Cavs fans suspected going back to last season- it's just out in the open now:
Koby ‘berated’ J.B. in his office after the Dec 18th game where Donovan played 45 minutes: “The immediate aftermath of that night was confusing. For instance, Altman was unaware at the time he was scolding Bickerstaff that the coach had asked Mitchell if he wanted to come out, according to league sources, and Mitchell declined. Yet, Mitchell was absent from the court for Cleveland’s next four games due to what the team called a non-COVID illness.”
“Multiple league sources have said, for months, that Mitchell did not have great confidence in Bickerstaff, and he was not alone. Several players questioned Bickerstaff’s strategies, game management, practice habits and accountability measures, privately and publicly, throughout the season.”
“Allen’s extended absence, which stretched more than two weeks, caused frustration toward him in at least some corners of the organization with teammates and staff members who felt he could have done more to try and play.”
“Furthermore, rival executives believe the Cavs will have to seriously evaluate the fit of Mitchell and Garland and ultimately may have to choose one or the other. Should Mitchell decide to stay long term, sources briefed on the matter say Garland’s representation, Klutch Sports CEO Rich Paul, would have a conversation with Cavs officials on potentially finding a new home for the one-time All-Star.”
“The Cavs seem to be at their best offensively with only one big on the floor, but internally, the franchise believes Mobley’s situation is rare. The focus has been on winning games, not necessarily fully developing his talent, like most players selected third receive in their first few years in the league.”
Following last years playoffs: “Multiple veterans in the Cavs locker room grew frustrated with Bickerstaff for treating the Cavs as a young team with much to learn, instead of as a team ready to contend. They were also less than enthused by the Cavs’ offense last spring and into the first part of this season. Mitchell was among them. Players would leave practices and morning shootarounds wondering aloud: “Why did we even do that? What did we accomplish” — so perplexed by the lack of structure and intensity in the workouts.”
Bickerstaff’s usage of Mitchell, league sources said, was a reason Mitchell provided when declining an invitation to play for USA Basketball last summer at the FIBA World Cup — a refusal that went a long way toward his exclusion from the Olympic team.
With his team down 1-0 in the series to the Celtics, Bickerstaff made an observation about Boston before Game 2 that left members of the Cavs organization perplexed; it seemed as though he was making an unfavorable comparison to his own team.