Tim Tebow has something Ryan Leaf didn't seem to have, potential. Yes, a lot of his stats are padded but as previously mentioned (about the mechanics) if he can learn those then he'll be a good to great QB.
If I were a owner, I'd be more worried about the concussion thing.
Ryan could have had potential if he had not had such a big ego, he was a trouble maker at WSU but not as bad as when he left.