"Listen, Kyle, you're our QB2. If CJ gets hurt it's your show the rest of the way. But we're not going to burn a year of eligibility for garbage time handoffs and a few passes, so now that you've played in four games, if we need mop up duty we're going to use QB3. You may not love this right now, but it's for your own good."
He basically threw half his passes (18) in his first appearance, and 3, 3, 6, and 8 in the next four. Miller threw 8 against Akron and 1, 2, and 3 in the next three.
This is very poorly managed. There is no reason to burn a game for two players to have them each throw 4-5 total passes if there's any danger in blowing a redshirt.
And imo if you're going to put a QB in for experience let him run the offense. It's not unsportsmanlike IMO if you're playing a bunch of backups.