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The OP "may" be onto something here, though there might be other explanations. Here are the ERAs for left and right hand pitchers at each of the different league levels. At Diamond and Perfect levels, the ERA superiority has switched from LHP to RHP...
Bronze LHP/RHP: 4.10/4.16
Silver: 4.07/4.16
Gold: 4.16/4.19
Diamond: 4.19/4.11
Perfect: 4.20/3.99
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