I just went through the entire history of the 2008 season elsewhere in the thread. The only game where it was remotely possible that it cost Iowa the game was at Pitt. Stanzi sucked balls against Iowa State, a game Christensen relieved him in, and Iowa won basically because Christensen handed it off to Greene and Brodell had a punt return. Iowa proceeded to lose the first 2 games Stanzi started against Northwestern and Michigan State and Iowa scored a whopping 13 and 17 points in those losses. Then Stanzi went 11-29 with 2 picks at Illinois (the final loss of that season).
I'm not one of those that think the coaches never make mistakes. Of course they do, they're human. But KF has a long enough track record of playing young players and letting younger guys beat out older ones that I'm going to be confident in saying they play who they think are the best players. That doesn't mean they are 100% correct, they play who they think are the best guys.
The bolded and underlined has always been the huge question with the offensive coaching. Not intent, but judgement.