1. Utah has to play better than they have all year by a large margin (with a 3rd string QB)
2. BYU has to play worse than its played all year most likely, worse even than Oklahoma State
Both of those have to happen with BYU having fantastic team chemistry and confidence focused on each game 1 by 1 and Utah having a destroyed locker room with no confidence in coaches plus injuries all over the field

Just doesn’t seem super likely to me