https://www.si.com/nfl/bills-bond-on-and-off-the-field-paying-dividends-afc-east
Good article on the foundations that have allowed the Bills to reload instead of rebuild.
I think sometimes we are too close to the situation to fully appreciate what we have. For as much as people want to crap on McD, he's one of the best in the league and we'd be hard pressed to replace him with somebody equal, let alone an improvement.