It appears there is one other effect from the Transfer portal and the redshirt rules.
Players at some schools are quitting their team before their fifth game with the intent of entering the transfer portal and preserving a year of eligibility.
Hank Bachmeier, the QB at Boise State, opted for this strategy after the Broncos struggled to a 2-2 start and his OC was fired.
Several SMU players are reported to be doing the same.
Portal is a dangerous game though. Sometimes these guys look at that greener grass and there is no turning back. Leaving a scholarship in hopes of a starting position is a gamble for 90% that enter the portal. They need to be careful.
Pat Fitzgerald made Kain Colter stop being a premed because labs interfered with practice. Even at Northwestern, no one is under any illusions that either the coaches or the players are there primarily for an education.
A beloved Miami basketball coach tried to force a player to change his major to avoid conflicts with practices. The player quit after his first year instead.