Some things about this story that don't sit just right. 1. The tackle on Edmunds looked like a nice form tackle to me. Not a dirty hit but one that was probably not necessary in that practice situation. If they had been running the Oklahoma drill for hours on end, that would be another story.
Also, some guys always play harder than necessary in those type of drills. I had a student who was once on the Miami Dolphins practice squad and Zack Thomas apparently took frequently and unnecessary shots at him. This looked like an unnecessary hit, but it was not vicious IMHO; 2. I could not tell from what I've read about Stahl, but my guess is that he was not a tenure track faculty member. My guess is that he is adjunct faculty or a part-time instructor. If he were I would think that there would be a faculty uproar about a person's position being eliminated for this type of reason; he is also writing a book about this issue
https://forgeorganizing.org/author/jason-stahl this might serve as some pretty good advertising. 3. Not sure what to make of the player and coach turnover rates. To his credit I recall that Hayden Fry had very little turnout of either. Go Gophers!