Oklahoma's defense struggled last year and we've seen that their offense is a system that looks good with different quarterbacks in it. They will play many bad defenses in the big 12 and Hurts has something to prove, Lawrence just won a national championship and is playing on a team with a good defense, he won't likely play late in many games, and Tua will likely get pulled late in games too like he was in week 1 since his injury last year hurt Alabama.
