Look at it this way. CU can't run the ball. Largely that's due to the fact that their OL can't run block. They also can't pass block. They've given up 39 sacks on the year. Compare that to BYU where we've given up 16.
Yes, CU passes the ball a higher percentage of the time than we do, but not THAT much more. Sanders has something like 450 pass attempts. Retzlaff has 350. CU's OL is giving up a sack almost 2X as often as BYU, even when adjusting for number of passing attempts.