Kaler was certainly the bigger issue.
Coyle, as the AD, should not have talked so much about things like improving the character of the team, "living in truth", etc. At that time, while Gopher football players were accused of sexual assault, an assault they denied, it's a bad look.
His press conference when he fired Claeys should have been something like "I want to thank Tracy for all that he has done here, but we decided to go in a new direction." It should have been vanilla as possible. It's difficult to listen to Coyle speak in the time between the bowl game and the hiring of Fleck and not come out of it with the impression that he didn't believe the players. He is entitled to that opinion, personally, but when you're their AD. . . it's trouble to verbalize it publicly.
I mean I agree Coyle could have worded some of his statements better. And that is normally the case as public speaking is not his strong suit. But his words were really vague. I took the whole "culture" and "living in truth" as more directed at Claeys. Kaler was way more pointed in his statements. I remember thinking at the time that he needed to be careful. Kaler's words were more along the lines of a rush to judge.
I guess I see a lot of people lumping Kaler and Coyle in together, and I don't think that is necessarily fair. Not saying Coyle was perfect by any means, but my sense was that the players were upset with Coyle for not doing an adequate job of explaining things to them, while it was more personal with Kaler in that they felt he was out to get them.