Experience Is The Best Teacher
Players can make great progress in practice, but ultimately, they must take their game to the actual course to see if they can apply what they've been working on.
I've used the golfer taking his practice range swings to the actual course in several instances, which is no different.
FSU has four games remaining, and only one of those teams has a stifling defense (Notre Dame). North Carolina (No. 76), Charleston Southern (FCS), and Florida (No. 39) don't have great defenses, and all three of those games are at home. Duke and Miami have higher ranked defenses than these three, so it's not like he'd see something drastically different than he's already seen.
It would be worth it to play Kromenhoek in these final four games. The more repetitions he can get in live-action, the better. Teams can only simulate real game action in practice so much, and many times, the defense knows what the offense is gonna do anyway.
I like how Mike Norvell handled the Miami game. He gave Brock Glenn a chance to start and make something happen. When he did nothing with his first two drives, he went to the young freshman. Kromenhoek led the offense on a touchdown drive on his first possession and moved the ball into Miami territory in the other three possessions he got.