If BYU loses to Boise, UCF or any other American contender is a no go. Not sure
if a BYU win helps a ton though.
If UCF has their spot in the NY6 no matter what (ie every other G5 champ has a loss) they can only gain from another game against BYU. If a loss to BYU would keep them out of the NY6 they won't schedule BYU.