Sounds like Utah almost has more to worry about as far as replacements on offense than BYU does. New QB, although Brewer has plenty of experience. Their leading returning rusher has 76 yards. They lost 2 starting WRs to ASU and BYU. They return their TE room, though they have injuries. Also return their entire OL.
Holy War should be interesting, I'd be surprised if either offense has much success against the defenses that BYU and Utah will be fielding in 2020.