Serious charge.
Brett Kendrick...offensive lineman...at a time when Butch was still head coach and Hoke's job was the defensive line.
Ty Chandler...running back...was sequestered by the medical staff immediately after the play that caused him to come up woozy...never got back into the game.
Will McBride...never came back after the one game he started...no one has said formally that he has a concussion, either...his injury is undisclosed.
...
So you're clearly not talking about any of those three.
And those are the only three that I've heard of that even might be concussions this season.
So when are you talking about? When Brady Hoke was at Michigan, or some other team?