It's not optional for him, all incoming scholarship players have to be there. He doesn't have to take classes, some of his teammates will work around campus, but if he's there he might as well take one or two.
But yes I think it is worth it. His pitching coach is as good as it gets so he'll listen to whatever he says. We'll see what happens with the draft, but there should be two weekend spots open. So he'll want to be used to living on campus, going to class, and in proper shape so he's ready to compete for a rotation spot. He's never done pitching specific workouts either so he'll be learning all of that as well.