Against G5 teams, BYU should be at least 85/15 against
Against lower P5 teams, BYU should be at least 70/30 against
Against mid P5 teams, BYU should be at least 60/40 against
Against top P5 teams, BYU should be at least 40/60 against.
When BYU is in a P5 conference, I would expect over time play against top P5 teams, BYU could be 50/50 with and in some seasons 55/45.