Looks like he has lost his confidence, which is a dangerous thing for young pitchers. Although plenty of guys have gotten over it, there are other examples of guys like Rick Ankiel, who never seemed to recover. They need to get this kid back to the minors quick, to work on his fastball some more, and to just get him to calm down, and build up some confidence. He still has some of the best "stuff" you will ever see, but he simply isn't ready for the big time.