BYU is essentially playing with 3 tackles and a standup OLB as a pass rusher, along with 2 other actual linebackers with a safety in the slot (the FLB position )
The post spring depth chart lists the line positions as E N T OE
We all know from last year that the FLB position is really almost a strong safety. The depth chart is Zayne Anderson, Matt Hadley and Morgan Unga - basically 3 strong safeties.
This isn't anything like the old dinosaur 4-3 that Utah was playing.
It is true that they are playing more man in the secondary than Bronco did, which might be a problem going forward.