Their #1 RB and TE declared for the NFL draft. If you look at their 2019 projected depth chart, you’ll see a large majority of the kids listed either started last season, or saw significant playing time as members of the 2 deep.
As I said in my first post, one could argue that BYU is still currently the better program, but to deny that USU is not returning a vast majority of their 2018 contributors is just flat-out fiction.