Which means your claim is weak.
In CFB, teams that are leading at half win an extremely high % of the time. Don't expect to see too many teams adjust at half and be successful. It rarely happens. In the BCS Title games, teams leading at half went 13-1(with 1 half time tie), and the one team to come from behind was Florida State, which just happened.
Point being, the real question is, does BYU get ahead and play well from ahead.