This seems more like confirmation bias than anything. Both things have reasonable explanations..
The Knighthawks due to him owning another NLL team (and I believe the NLL telling him he has to sell one of the teams eventually).
The Bills due to the NFL allowing private equity ownership. You're going to see stories of every team in the league selling off some portion of ownership because the price paid will be very high and with the stadium coming in, it makes sense that Pegula is one of the first to move on it.