I thought this article from Bryan Driskell was pretty good about Shepard.
https://www.si.com/college/notredame/.amp/football/notre-dame-football-needs-a-home-run-hire-at-wide-receivers-coach
I know that at least recently he has coached Bell and Moore both who caught over 1000 yards as freshmen. I was very impressed with Bell’s advancement specifically. I think he would be a good fit.