1) He takes the fifth year and competes for the starting QB job. I'd expect a 2 headed monster like we saw against LSU.
2) He decides to transfer soon. ND still gives him all of the same support academically that he'd have if he were returning. This would be a great demonstration of our commitment to the academic success of our players, and allow Golson to go on to a starting job elsewhere with an ND degree and a great relationship with the university.