You don't recall even when Rees was a player he would just walk away and ignore Kelly when he was yelling at Tommy? He's never been afraid of Kelly or gave a shit what he thought.
Rees threw the ball all over the yard against Okie State and it was because "He runs the Kelly offense". Now he doesn't throw enough and it's the same criticism. I remember everyone loving Rees's game plan against LSU in a bowl game and thar sure as shit didn't look like a Kelly game plan.
Rees can fail all on his own without the help of Kelly. Or succeed for that matter.