It's been written all over the place. Here's the one from FG since I already had the site open:
http://www.fangraphs.com/blogs/top-3...tlanta-braves/
Lucas Sims, RHP, 1.8 KATOH+ – Sims will sit 94-96 with a plus curveball, but the fastball plays down due to its flat, lifeless nature. Sims’ delivery is a bit stiff and oddly paced, resulting in 30 control. He needs to improve his ability to throw strikes just to be a middle-relief piece, and there’s a chance he never gets there.