Utah's secondary has to cover one guy: Trinnaman. BYU's has to cover Carrington (1900 yards) and Singleton (~500) before we even get to the sophomores, both of whom have over 150 yards each.
I'm quite confident Utah's defensive backs can cover Trinnaman. If your 2nd and 3rd WR can step up, great, but they've shown no evidence of that so far.
So Utah's DBs can cover your WR. Can the safeties and linebackers cover your TEs? Maybe not, but that's a different question (and Utah's returning TEs are more experienced than yours as well).