Let's be clear: Jim Kelly has zero say in the Bills' draft strategy -- he might even tell you that the team has no business taking his advice. So when he says the Bills should draft Tim Tebow, it's like you or me saying the Bills should draft Tim Tebow.
Now, does that mean the Bills won't draft Tebow? Hardly. It would be a serious reach for them to take him at No. 9 overall, but I can't see them letting him get past them if he is available at No. 9 of the 2nd round, where the Bills next pick.
In that way, the Bills book-end Tebow's floor and ceiling. (Jim Kelly can feel free to use that analysis.)