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Only threw 11 changeups on the year. Of course, that doesn't mean he doesn't have one. He just doesn't need it in relief. Maybe with more use it could be a good one.
One concern with Kelley as a starter, and the reason he was converted to the bullpen in the first place, is health. He had TJ surgery in college and dealt with some elbow injuries in the low minors. Once he landed in the 'pen he was in the big leagues in no time flat.
The article just implies that they want him to be more than a 1 inning guy, which makes sense if they're going to go with a short bullpen. I wouldn't get too excited about the SP possibility.