For posterity I've clipped the video of the helmet to helmet hit and Michigan's actions after, plus the decision to insert him into the game after Gardner's helmet popped off.
The booing you hear in the background is fans demanding that Morris be removed, as it was even more obvious Morris was not right if you were looking at him for those 20 seconds uninterrupted. The only guy in the stadium who didn't know was Hoke.
Bluntly, anyone arguing that we shouldn't jump down Hoke's throat because of the slight possibility Morris was not concussed is an idiot.