I worked it out as such (assuming, SP1 starts on Day 1 and so forth through SP 4 on Day 4):
Day 1: Roster is 4 SP, 9 Position Starters (w/DH), 8 RP, 4 Bench Players
Day 5: Call up SP5, send down RP8 (Bullpen has 7 players for this day)
Day 6: Call up RP9 (RP8 is stuck for 10 days), Send down SP5
Day 10: Call up SP6 (SP5 is still stuck in MiLB), Send down Utility IF1 (Bench is 3 for this day)
Day 11: Call up Utility IF2, Send down SP6
At this point, I've rotated 2 SPs, 2 RP and 2 Utility IFs. The total 40-man roster space used by these players plus the other static guys on the roster is only 29 players. I made my Day 1 a Friday, so Day 11 would be a Monday and Day 14 would be a Thursday. Given MLB scheduling, one of those is likely to be a day off except for the 20 games in 20 days that every team plays once during the season. Even the 1 off day gives me the ability to just repeat this rotation and multiple off days allows me just to skip the 5th spot in the rotation entirely.
Mainly I was just trying to see how viable a 4 man static rotation with an occasional 5th starter would be assuming that 5th and 6th SP could be stashed in the minors and rotated in favor of a true RP or extra bench spot. Unless there is something I'm missing that limits the transactional portion of this, I think it is doable and wonder if MLB teams might look at this given the extra off days as the Rays are.
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