The Bills averaged 5.3 yards per rush attempt. Stats don't tell the whole picture but still that's very good. Likely it's inflated due to teams concentrating on stopping the pass.
Barkley would be a dynamic dual threat. A game changer for the Bills offense. Think CMC for SF.
However, the Bills can't afford him, injury prone, and I highly doubt Dorsey will utilize him appropriately. So the point is pretty mute.