Realistically I can't say what Utah's offense will look like, and I'm pretty worried about the OL. I don't think BYU has any chance of running the ball on Utah, but I worry about the secondary, although I do expect Mangum to turn it over. He doesn't have WR like he had in 2015, so he can't chuck it up and expect them to save him. I expect 2 INTs from him in the Utah game, more if LSU has really destroyed his confidence the week before.
I also do think that Utah having a long week and BYU having a short week, with travel, after LSU will cost you guys some points. My real prediction right now (without seeing either team play yet) is more like 31-24 for Utah.