Great Research. Based on your earlier discussions, I also did a deep dive on the series analysis. Although a longer response is needed, my first point would be to suggest removing the Shean and Graham from the initial list of SP's. I think it's easier to think in "classes" rather than SP/non SPs...while total populations may be similar, the 14 other sps are virtually identical in terms of back appearance and populations, whereas Shean and Graham are clearly different, though total populations might be similar.
For the record, in my categorization, I have Shean in Graham in the same class as players like Austin, Bates and Becker...it would be interesting to hear your thoughts on including Shean and Graham with that group.
Mac
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