let's say we lose to asu and beat Colorado and Oregon. We tie with Colo and usc if Colo loses to another one and usc loses one more. we would win the tiebreaker because of head to head matchups.
the only way we win the division with a loss to Colorado is if usc loses and we want that loss to be to Washington because if they go to the playoff the Rosebowl is open. we would win that tiebreaker because of our division record. in that scenario Colo would have two division losses (Arizona and usc) us and usc only would have one division loss and we win the tie with usc
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