Duke was a starter virtually his entire minor league career, and a good one at the upper levels, because he has multiple pitches. I think moving him to the rotation is a pretty good idea. It's possibly the only option for him right now, too, since I don't think his arm can handle the lack of rest that comes with relieving anymore. Also, he's never imploded like Turnbow. He got injured. Otherwise he was still an all-star caliber reliver. I don't think Turnbow would be as good of an idea.