Your assumption is wrong. Smiths best two pitches prior to coming to the Brewers were his power fastball and plus changup, he also had a curve to go with it, he just started to develop the slider before he came over. He has 4 pitches, 3 of which are plus or better. The only reason you only see the slider out of the pen is because it's become his best, and in short stints you use your best pitches. Here's an article on him on fangraphs from around the time of the trade, good read to put with what we have seen out of smith. http://www.fangraphs.com/blogs/brewers-land-will-smith-and-his-possible-breakthrough/ If what you were saying was true he would already be an ace on our team. But since he continues to be in the bullpen it is quite obvious the Brewers do not view him as a good enough starter to outweigh his value in the bullpen. Will Smith does not have 3 plus pitches. He has one plus pitch in his slider that is it. The article talks about his NOT overpowering fastball and his not so great change up. That is exactly how I would describe both pitches in the present, though he never uses his curveball. The article states what I already said. Will Smith is a back end of the rotation pitcher and even that isn't a sure shot. He has so much more value in his current role. Right now Will Smith is a rare commodity, as a starter he would be one of many back end types.