Listened to the Dan Patrick Show, and Urban Meyer mentions that Mariota reminds him most of Braxton Miller. 

I know Braxton can't start throwing drills yet, but do you think they have used him in practice to help prepare for Mariota's scrambling ability? Obviously running requires so much use of the shoulders, but this was just a thought. As I'm writing this, I just remembered they could be using Marshall at the qb position too to help the defense.