He may need more than that. A complete tear-down and build-up of his mechanics may be in order. Now, I'm no expert on mechanics - I'm only going by the lack of command he shows, and guessing that he needs to sacrifice something in exchange for it. Something's not repeatable in his delivery, so that too many of his pitches are a complete waste of time, such as the fastballs that sail up and outside, causing no shadow of doubt in a batter's mind. It's possible that more control will come at the expense of the already weak sauce that his fastball is, in which case it may be a no-win situation. But the status quo isn't going to work for him, and at his age he's got basically a couple of years to straighten up before he gets buried in the depth charts for any team. He's got passable stuff, so there's at least something to work with.