I think the majority of college and pro head coaches have HUGE egos. Surprise, surprise.
Look at Ferentz over in IC last year. CJ Beathard was heads and shoulders better than Rudock, but KF stuck with Rudock basically all year because that was his guy that he decided should be the starter last year. Coaches have egos and are stubborn. Playing CJ this year was ok because it was KF's decision to play him, and not pressure from the fans or media. Coaches do not want it to look like they were wrong and the fans and media were right.
So Rhoads really doesn't want to see Lanning come in and play lights out when Rhoads himself basically said he wasn't ready this year. That makes him look bad. So if Lanning does come in and play well, Rhoads is going to give the credit elsewhere.
But I'm sorry, the rest of the team did not play any better for Lanning than they did for Richardson. Lanning just made more plays, made better decisions, and was able to move the ball. Rhoads just will not be able to admit it I'm afraid.