He's proven to be a very average QB on the decline. In the last four years his tds/ints: 10/9, 6/12, 11/9, 3/4. He is no safety net and would only give you a false sense of security.
Maybe GOD AWFUL was a bit harsh, but in preseason games(which is all I can go by) he looked a lot like Trent. Been there done that. No thank you. The two QBs the Bills kept were the two who showed the ability to move the ball well in game situations.