^^
To an extent, yes. However, Saunders' comfort level with Collins is also allowing him to run more plays differently than he would with Campbell. And while Campbell is progressing, there is a reason Collins looks so good out there. He could run this offense in his sleep. Right now, the defense is keeping games close and the offensive execution is better. Is it because of Collins, or is it because these guys finally know what they are playing for?
As far as Campbell goes, he's pretty much done for the season, unless a deep playoff run allows him to get back to 100%...at which time, you have to stick with Collins anyways, but better to have JC backing up Collins than Old Man Brunell