A few more (which help Kelly)

TJ Jones [4*]: 23 rec for 306 yards, 3 TDs
Corey Robinson [3*]: 9 catches for 157 yards, 1 TD
Kevin Stepherson (as noted below) [3*]: 25 catches for 462 yards, 5 TDs

None of this is to defend Kelly. I think he needs to simplify to let talent on the field even if it's in a limited capacity. Poster in this thread rightly point out that Weis put in Golden Tate for a few plays every game just to run either go routes or WR screens. If a guy has talent, there's no reason why we can't include him for a few plays each game even if it is as an obvious gadget (like when Cordarrelle Patterson is in for the Bears or when we used Lenzy in '19).

Still, even more successful teams have this issue. Ohio St seemed to have an issue getting Julian Fleming and Jaxon Smith-Njigba involved last year when both were 5* players, although this could also be scheme-related. If I remember correctly, the Ohio St offense has a lot of WR option routes which vary based on zone/man, alignment, and whether the defensive back is in press coverage; this sounds similar to what 84David described above as what ND demands out of its WRs.