Then it'd be Key's responsibility to push back and say, "hey man, doing this is going to doom us". "I'm going to have to resign if you set me up to fail." It's an apologistic conspiracy theory that Collins had his tentacles in everything and all the OL, recruiting, and in-game coaching failures were his alone. The simpler explanation is that Collins, being a bad football coach, hired bad assistant coaches and they performed poorly.
The Collins I observed delegated a lot to his assistants and didn't do so much football coaching. Assistants were giving press interviews way more than under Paul Johnson, and each assistant (Patenaude, Thacker, etc.) talked way more football than Collins did.