has something to do with the struggle to recruit good DL's. A 4-3 system like Utah's or others where the DE's pass rush and there are two DT's would seem a bit more exciting to a HS kid IMO. Whereas BYU's DL is often asked to eat up blocks and free up the LB's to make plays is less glamorous.
I also think Tuiloma will end up being quite good, just a Sophomore right off his mission.