It's an idea. Seems like a lot of assumptions:
1. That he could pass a physical. He did not play at all in 2010, and also missed the last 5 games of 2009. If he still failed his physical with the Raiders, it leads me to believe he probably is not going to pass our physical either, and may have some permanent damage. (Notice that no other teams have shown any interest since he failed his physical with the Raiders.)
2. Assuming he passes his physical, how much of an improvement will a guy who hasn't played football in a year and a half due to a back injury (and who by all accounts still seems to have some issues with his back) be over our existing lineman? I would imagine that back injury may have limited his workout routine.
3. That he'd be willing to agree to this kind of salary arrangement. Maybe he would. I don't know.
I would think that if the Bills (or any other team) thought he had any chance of passing his physical, and agreeing to this type of contract, he would have had some more interviews by now. There's at least 15 other teams out there who like like some help at tackle too.