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TLDR: Analysis of data from roughly 1000 leagues does not support idea that differences between pythag. expectations and actual wins indicate a bias against long-time managers.
I pulled data for about 1000 leagues. I defined long-time managers a few different ways, but I'll talk about one simple method I used. I defined a long-time manager as one with a member number less than 8 digits. For those long-time managers with at least 10 seasons in the data, I calculated the average pythag. error. (difference between expected and actual). If we define lucky managers as those with average errors of -1 or less (pythag exp. - actual < -1) and unlucky managers as those with average errors of +1 or more, I count 26 lucky long-time managers and 24 unlucky long-time managers (and yes, J-PAV is among them). There were 61 long-time managers that were neither lucky or unlucky.
This doesn't prove anything with regard to whether SOM has its thumb on the scales, but it does satisfy me that pythagorean expectations are not the proof that this is occurring.
By the way, the data I pulled indicates that a more accurate (minimizes square error) formula would use 1.73 as the exponents instead of 2.