That's where BYU won the game, full stop. In the past Utah has fielded 4 dlinemen on the field at once that all played in the NFL. This Dline was pedestrian at best, and they got blown up the majority of the game.
Honestly their LBers and secondary is probably as talented as they've been recently, but that line was nothing compared to previous seasons.
Devin Kaufusi was playing significant minutes, let that sink in.