This program is needing a complete rebuild and I do not blame any players that want to leave after the toxic culture that was exposed this year. The head coach that recruited them was fired and many learned after the fact (if they did not already know while he was still the coach) that Frost had issues with the bottle. They then come to trust and appreciate the interim head coach who they loved and find out he is arrested for attacking his wife. If my son were in such a program I would fully support him looking elsewhere to get a fresh start, and I imagine we will see even more players test the portal.
The best way to retain some of the defensive players is to hire a stud defensive coordinator that gets them excited about the new direction of the program.