On paper with the stats in front of you it looks like a solid move. However, this is Buffalo you're talking about. On this board RJ was mocked for having a headband and his hat to the back. I can't imagine the outcry from the fans if we signed Stewart.
The Bills need to sell tickets. Bledsoe can do that based on his past acomplishments. This move would not sell more tickets.
However, don't get me wrong I agree with you that on the field he could help us.