Wouldn't Gailey have to re-structure the playbook to fit Tebows style of play? Tebow isn't the gunslinger that Fitz is, but he is bigger and tougher. If Gailey were to devise a "wildcat" option for Tebow then what would become of Brad Smith? Also, say Fitz does go down, or have a bad game how long is it going to take for fans to start chanting Tebow, or renting billboard spaces. I agree that Tebow is humble enough not to be a locker room distraction, but he will be a distraction none-the-less whether he intends it or not.
IMO, if Tebow were on this team the only option would be for him to start. If Tebow came to the Bills I don't see Fitz as part of this team anymore. All of the bonding that guys like Stevie, Freddie, CJ, Chandler and the Wolf Pack have done with Fitz would be wasted.
With that said, I like Tebow, and what he would bring. I also wanted the Bills to draft him and was pissed when Denver beat them to it. I just think that bringing in Tebow now would do more harm than good. It wouldn't be worth it.