The Pats have had some terrible secondaries off & on the past several years, they were able to score at will several years ago but got scored on the same. There's a balance here and the Bills can't afford to let our great players leave, unless they will only play based on being the top paid player at their position. You run out of cap bank real fast paying everyone all the money, all the time.
Imagine a scenario were the Bills cave & overpay, then everyone hires Parker. Try to field a team then, it's just not reasonable.