Coaches get paid big money for one thing. Win games. No position is guaranteed. This is how it works with big time college football. It's not personal. DB is a great kid. But up to this point Maiva has proved he's our best shot at winning games.And that is the bottom line, not how bad a certain player may feel by losing his spot. Nobody gives a crap if the backup DE ends up starting over the 1 at that spot during the season, that's football.
That said, Maiva is a true FR. He will have spots and games where he looks as such. There is absolutely nothing wrong with using a 2 QB system and rolling with whatever is working. DB could absolutely win his position back. If the kid who loses his job sulks, next man up and best of luck in the transfer portal.