The photo of him being it can be found
HERE. I took it.
As I wrote in the preview, I knew something was up when Cade stayed in when Iowa reached the red zone on its first drive. That Sullivan was held back indicated it was planned for him to rotate in later. KF said they were considering the third or fourth possession of the game. It ended up being the fourth.
I do think CM was hurt. He took the late hit and then the shot on the Pick-6. KF said the concussion was diagnosed at halftime. I don't think Iowa would tell the public CM was going to through protocol this week if he wasn't. That could be problematic on multiple levels.