It's one thing with pro sports teams, where players are on a team for a decade or more. If you had a Hall of Fame-level career at a place and the team decides that no one will wear #12 or whatever again, OK, that's cool. It's fun to go to a Celtics game and try to recall all like 20 guys whose numbers are up in the rafters, and, no, no one should wear #6 or #33 for that team ever again. There's plenty of other numbers to go around.
But college players come and go all the time (especially now). Daniels was at LSU for two seasons. Heisman or no, he was a rental. And you have 105 guys on a college football team who all need numbers, even with this confusing silliness where two players share all the good ones. No one's ever supposed to wear #5 again because of a good QB whose team didn't even make the playoffs?