Finally the Cougars will get a bit of break after playing half of the Pac 12 South when South Florida comes into Provo. South Florida should not be very good at all and will likely finish last in the AAC for the second year in a row.
The only way that I see BYU losing this game after a 3-0 start is if the Cougars are taking a huge deep breath of relief and celebration just to find themselves down 21-7 at halftime. Even with a halftime deficit, the Cougars should have enough to come back, but with an unlucky turnover or trick play gone wrong, crazy things can happen.
Barring something like that, BYU matches up better against South Florida in every position and should end this game before halftime.