Bringing JJ in to start that drive after what he did the last time he touched the ball was the real head scratcher to me. Granted you can't plan for something that disastrous to happen but why even risk putting him in that position at that point?
I will say again though that I think MSU deserves a ton of credit though for how they played in the 2nd half. Walker was an absolute beast, no matter what Michigan tried they couldn't stop him and I don't think there should be a ton of shame in that. He's playing like the best player in the country so sometimes you face a guy that you can't stop. Then the one WR made for them made 2 spectacular 1st down catches(some may say that the one hit the ground), if he didn't do that then the drive probably stalls. Sometimes teams can come back and it not be because the other team choked, sometimes you just play really well and I think that is what happened in this game.