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Here's a neat article from BP.
They use a paradigm: If a pitcher's 3-year history is his 'established level of performance,' which 4-man rotations were highest going into a season?
On that basis, there is a BIG gap between [Braves & Phils] and everybody else in history. So in that sense, you sympathize with the greatest-rotation-ever hyperbole.
Of course, there you've got to bring in Cole Hamels as a #4. 4-man rotation is a different conversation than, "which two teammates gave more than a reliable 12 WAR a year."
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Put Maddux and Glavine on a .500 team, no other changes, and that team projects to a 93-69 record.