I'm a Bills fan so I feel the need to comment on the Pegulas.
The reason the franchise was able to turn things around (after 17 straight years of missing the playoffs) is because they hired Sean McDermott. In football, the coach basically runs the franchise.
And McDermott runs a tight ship. He, like Dean Lombardi, wiped out all the staff and brought in his own guys. He brought in the GM and the coaching staff. Traded away a bunch of players that didn't fit his mold. Set the franchise in the right direction; gave it a philosophy. Even before Josh Allen was good, McDermott had them winning games.
As an owner, when you go to hire someone to run your franchise, it mostly just comes down to luck. When the Pegulas hired McDermott, they didn't know if he would be able to do this or not. They had tried 3 other guys before him and they were all failures.
The Bills were also fortunate to draft Josh Allen. How often do you draft a QB and they actually pan out? Again, there's a lot of luck involved there.
In Football if you get the coach and the QB right, you're set for a decade. Hockey is more complicated. No one the Pegulas have hired to run the Sabres has been able to turn it around. They've even tried tanking and that didn't work.
Interesting note about the Bills and McDermott; they actually had the Patrick Mahomes draft pick, but they traded it away to KC.