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I'm a fan of 6 man rotations.. Most guys do better with 5 days rest (NPB has it right IMO), so if you have the depth it may actually be worth it.
In the Ms case they'd need one more starter to pull something like that off.. Felix-Lee-RRS followed by 3 scrubs is too much.
If they add another starter it could make a TON of sense... all of our starters are better with 5 days rest. Lee and Bedard are WAY better with 5 days rest. Felix is neutral. Snell is better. With two fragile guys in Bedard and RRS it seems to right way to go (if they get that extra SP).