Some great posts in this thread, but I think we can agree - More reps, RB, C.
It's not JJM's skillset I'm worried about (as mentioned once KOC got out of his "head / mechanics" and let the kid loose)it's his durability. I'm not sure he can last a full season. That said, not every pitch needs to be a fastball.
Also, I think his hype gets in the way of his head. Diving head first and driving into GB's backups puts a huge target on you.
Just run the plays, grab the tablet and LEARN.