Food for thought:
LeSean McCoy, while younger, has just under 200 more carries than Fred Jackson and a similar number of receptions.
This one of the vets I would feel most confident in the Patriots signing (way more than Reggie Wayne for example) - he's such a great locker room presence and a genuine leader of men.
He's always brought it 110% every game without the need to resort to smack talk or showmanship - this is a guy you want on your team.
He was the one guy on a consistently awful Bills team that seemed to sting us every time with a big play or 3rd down conversion - think what he might do under Belichick and working with Brady - think about the awesome level of pass pro he offers.
Sign the beast.