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Defense (with park) explains the whole thing?
Am not doubting you -- would love to see the mystery solved -- El Sid's teammates had good ERA's, though, right? What do you do with that fact?
And El Sid had what, 9, 10k's a game... isn't that type of pitcher less dependent on context?
::taps chin waiting for answers::
Yea, unfair ADJUSTMENTS would explain a lot, 'cause he had some nice ERA's, right?