Lazor is terrible, but realistically you weren't going to change the offensive system as it is so unique to Bill Lazor and nobody was gonna be able to do much with it that was currently on this staff and you certainly weren't gonna completely go in another direction as that is too much for any offense to handle in the middle of the season.
You were basically tied to him and then can gut him after the season. Thats not on Campbell, that is on Philbin/Ross from last season.
Campbell was never a serious candidate to be the full time coach unless he got results. A 2-0 start wasn't gonna change that, he needed 9 or 10 wins, which probably gets him in the playoffs this year.