How long's it been since he was fired by the Tampa Bay Bucs?  I think 2 going on 3.  He was most likely still getting paid by the Bucs, and I what I read when Ohio State hired him back in January was he spent a couple years visiting different pro and college programs.  Learning some new stuff.  Once he figured out he wanted back in the college game, he and Urban are good friends, Chris Ash took the Rutgers job, and Urban asked Schiano to become co-DC (Luke Fickell is the other co-DC).  Schiano is a great defensive mind.  Nothing wrong that I've hear about other than he apparently had problems communicating and dealing with professional players.