'If your rotation has an elite caliber pitcher, yes, you would be reducing the amount of innings provided to that arm. The Twins, however, do not have that type of starter at the present.' There are pitchers better on this rotation than others. They are not carbon copies of each other. Any way you slice it, any time you make a rotation larger, an inferior pitcher will pitch in games where a better starter could have pitched. 'On the whole, the rotation is decisively average. In theory, stretching out the arms is one way to increase production.' How does this stretch out their arms by pitching less games? It limits innings. 'Second, a pitcher's career prior to the majors did not always follow the four-day rest schedule. For instance, Berrios has had anywhere from five-to-seven days between some of his outings this year.' What are Pelfrey, Santana, and Milone used to? I said many not all and when in the majors, the routine is every five days, doesn't matter what they may have done in the minors at some point. 'My biggest hesitation to the six-man is having that many pitchers and reducing the bench (although the bench hasn't been great either).' I said this in my post. If we don't care about giving our team the best chances to win as many games this year as we can, then go with a 6 man rotation. Pitch inferior pitchers and mess with their routines instead of making a tough decision.