RE: And in 2021 BYU plays essentially a PAC12 schedule. 5 games vs them. Swings
In 2021, the cougars play only FOUR games vs. the Pac-12: Utah, Ariz, Ariz St, and USC. And playing "FOUR" Pac-12 teams isn't "essentially a PAC12 schedule".
And FWIW, neither is playing five! A Pac-12 schedule stipulates that one plays NINE!