I'm not lumping Tressel into any group. I'm saying College success doesn't necessarily mean NFL success.
Two NCAA roots Head Coaches won Super Bowls in the NFL, Jimmy Johnson & Barry Switzer. The latter with Johnson's team.
One of the greatest college coaches of all time, Bud Wilkenson, failed miserably in the NFL.
I'm not saying every NCAA head coach who has NFL roots will succeed if he goes back to the NFL. Butch Davis is a good example, but I'd like to point out his true roots were college at Miami on Jimmy's staff.
I'm not saying Tressel can't succeed. In fact if you research closely you'll find that I am one who roots for Kirk Ferentz to get an NFL shot. So, I'm not downplaying college to pro transformations. Merely pointing out college success doesn't equate to NFL success and I used Pete C. as the example.
I think Tressel could have better success than a lot of candidates because he runs an offense suited to the Pro Game, similar to Jimmy Johnson when he got his shot. Spurrier did not and look how that evolved.
The reason most think Weis can succeed is because of his roots in the NFL. Is it a birthright? Of course not.