Apparently, Moskos was previously using a temporary delivery instituted by Dean Treanor as a teaching tool. At some point they were going to take out the teaching tool, and they decided to do that when he got to AAA. Moskos struggled with getting comfortable with the new delivery initially which he attributes to his flame out in AAA last year.
It's good to see that perhaps Moskos is on the right track now after most of us had written him off long ago. Now that he's been called up, we finally get a chance to see how his stuff will play in the bigs.