With the first three opponents expected to be more run heavy teams, and Utah being thin on experience at LB, I could see us going with a 5-2-4 look. DL is one of the deepest position groups, so why not make up for linebacker deficiencies by having an extra DL on the field?
The only passing game threat that worries me for BYU is their TE Bushman. He did some damage last year. The rest of their receivers should be handled well by our DBs.