He's an egomaniac. Two undefeated years in a row in college with a probable national championship this year and almost certain to be a strong contender next year. His ego will be at an all-time high, and that's saying something.
He's driven to win. He won at Toledo. He won (a little) at Michigan State. He won at LSU. He's winning at Bama. The only blemish on that was the NFL stint. You just KNOW it eats at him.
He's a money chaser. Michigan State to LSU to the Dolphins to Bama...all for more money. Jerry could throw ungodly amounts of money at him, promise him TV exposure like no other NFL team gets, in a new kajillion dollar stadium.
It just makes too much sense.
Plus, his wife hates Tuscaloosa.