Duensing did not fail quickly as a starter in 2009 or 2010. He was quite useful as a starter both of those seasons. We probably don't make the playoffs in 2009 without him. Given his profile, I doubt his later mediocrity had anything to do with his usage pattern those early seasons -- credit to the Twins for capitalizing when he was performing well. Slowey actually went on the DL when he went to the bullpen in 2011, before they even tried returning him to the rotation. And he spent time on the DL each of the two previous seasons as a starter too. Not sure how any of that is relevant to Duffey, who I don't believe has had any notable health concerns. You're not finding counter points, you're find examples of players who have failed. I don't doubt Duffey might fail too. But fear of failure is not rational decision-making. It's still common practice to move starters to long relief temporarily and back again. I doubt that the failure rate among such pitchers is notably different than the failure rate among pitchers overall, but if you have data (not anecdotes) that suggest such a conclusion, I would welcome it. If there is something specific about Duffey that suggests a move now would be problematic, I would more than welcome that information. So far, all of the concerns have been pretty generic and anecdotal, and seem to be portraying Duffey as more of a "good luck charm" in his current role than as a capable pitcher.