I will add: the Pegula/Bills state of the art training facility also make the Bills player friendly and an attractive destination. I read somewhere that the Bills facility is top 3 in the NFL. Add conservative injury treatment to that desirable.
Imagine as a free agent: you can go play under player friendly coaches, a beast of a QB, conservative trainers/injury handling, a state of the art facility, and Bills Mafia shovel you out of your house. Who can say no to that?