If you only look at the extremes, it's an easy decision. If Duffey is doomed to repeat his 2016 ERA as a starter? Sure, put him in the pen. Or if he can repeat 2015? Starter, no prob. Or if Duffey is going to rebound to his early season 2017 effectiveness in relief? Sure, he could be a pen weapon. But I think the reality is more muddled. Given his profile, I think he probably settles in closer to average in whatever role we put him in. In which case, there is still definitely an argument to be made for trying him in the rotation again. Kinda wish we had been more aggressive with, say, Hildenberger already, and kept Duffey stretched out in relief better, and it might be an easier transition. At this point, I am pretty sure they're not going to bother making the change before the end of the season, which is disappointing because it could have helped inform our offseason planning a bit better, in regards to FA, Trevor May, etc.