Just looking at his B-Ref file, your Worley analysis makes sense. But there are two back stories. The first is about how he gained his success in 2010 and 2011. A lot of his success was due to his unusual movement. As Parker wrote after the trade, got a lot of called third strikes on pitches he would throw at left handed hitters. Though his swinging K/9 ratio was low, he had decent K/9 rates in 2010/11 (8.3/8.1). Even in 2012, his K/9 rate was pretty good (7.2). So what happened to his K/9 rate in 2013 (4.6)? Some of it is league adjustment. If you earn your living on deception, you will have a larger than normal drop in effectiveness from the NL to the AL. Part of it was injury-related. He was pitching pretty well in 2012 until he developed bone chips, which limited his ability to throw his signature sinker with the same movement. In August, his Ks plummeted. He was shut down in September and had surgery to repair the elbow. When healthy again in 2013, he did not have the same movement on his sinker. Though he threw it in the same location a lot, he rarely got the call because it stayed inside. Will he regain that movement? I don't know. But I compare him to Nick Blackburn, who had similar success (though not through looking Ks, through ground balls) through two years of pitching. Then he developed bone chips, which limited his movement. He never regained it. Blackburn is a common story for guys who rely so heavily on the sinker. They develop elbow problems and struggle. I personally believe he can gt back some of the old magic, but I don't think 2012 is even his upside. I think he'll continue to struggle with AL hitters with his limited two-pitch arsenal. And I think he'll struggle to get the feel for his sinker back. Either way, he's a work in progress. I doubt he has the time to prove it before they have to cut him lose.