The Bayern locker room needs a firm and strong hand and a coach/manager with a clear idea about what to do and how to approach a game. These players have won everything there is to win, of course they ain't gonna listen to a guy who can't motivate them
That's how it is in the biggest clubs and that's why it is so hard to coach in clubs like Real and Bayern. Hitzfeld said it quite clear himself, coaching Bayern for 6 years is like 20 years in nearly all other clubs. The pressure is immense from the outside (media, fans, board members and so) and the players are lunatics sometimes
To succed in Bayern you need to win the respect from day one and Kovac never did that. Im sure he's a nice guy off the field, but he was a shit coach at the task he had at hand, and there's nothing that is gonna change my view regarding this
The one to blame for the misery was Uli who lost touch with reality after he came out from jail. Carlo was sacked for far less than Kovac, but he was burned out and didn't care for the job