* His mechanics are a mess. He's opening up his body too quickly during his wind-up, which leads his pitches to tail.Ayala, as you probably know, had Tommy John surgery after blowing out his arm pitching in the World Baseball Classic in 2006. Usually, a TJ survivor slowly rebuilds arm strength and isn't really back till they're second year of pitching, or third year after the injury. That would be this year, but the human body is a funny thing, and some people take longer than others to heal.
* He has no confidence. Most of all, he's lost confidence in his go-to pitch -- his sinker. He used to throw it four out of every five pitches. Now, he's using it just half the time.
* Neither St. Claire nor Manager Manny Acta think Ayala has been over-worked. They don't think he's injured, either. He can still hit 95 on the gun, both said.
When Harlan reports that Ayala used to throw the sinker more, he's referring to before the injury. You can see here, he's thrown it less ever since the TJ.
So, considering that, you have to wonder if they can so easily dismiss the possibility that there's nothing wrong. No, he may not be hurt, but the overwork, plus the rebuilding arm strength could be causing him to try to throw the pitch harder, which could be causing him to fly open and lose command.
I don't know if that's what's happening, but it seems like a plausible theory. Certainly those are follow-up questions I'd like to see Harlan ask, rather than just accepting at face value that he's physically ok because he can hit 95 and that the problem is that a 30-year-old formerly dominant set-up man suddenly is just losing confidence and screwing up pitch selection.