Here is what Kirk said in the post game:
One of the things I wrote after the Michigan State game when I questioned why Robinson was in the game up 37-6 in the fourth quarter, was that once you get one concussion, you are 400% more likely to get a second concussion...and the effects of the next concussion are more severe and longer lasting.
If he has another one, and watching him walk off the field AFTER the game was over, with someone holding his arm all the way to the locker room ant slow, I suspect he does, it's a huge concern.