Jack Tuttle was the break glass if there was an emergency. Michigan needed a QB with playing experience if JJ somehow got hurt in Michigan's run to a National Championship. Its seems that very thing happened but JJ played through injury against Maryland and Michigan snuck out with a win.
Jack saw a huge opportunity for him next season but was out of eligibility. Either way he was going to stay with the program as a GA assistant or maybe the starting QB. He got part one of his wish over the weekend as his waiver for another year got approved.