I think it would be fair to Shady to let him play his remaining years on a contender, so I would be OK with a trade. A starting running back and a 3rd is a good first request by the Bills. Then when the GM stops laughing they can start negotiating. I'b be ecstatic if they could get a 2nd for Shady given his age, how much he has been used, and his current contract. More likely a 3rd without the starting RB is what I would guess the Bills could expect.