It's pretty effing stupid to try to guess what his motivation is, since no one ever knows what the hell he is thinking. That being said I still think the the true reason he came back was to win a NC. You just can't be as consumed with football, as he is, and not care about winning a NC more than anything. I bet after he passes, we will hear all sorts of stories from his close family and friends about just how much of his life was consumed by this.