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This one is hard to figure out (the data is all over the place).
A 0.5-0.75 ERA would be enormous btw. If RJ really has such an effect, than the Ms are winning the division next year. I wouldn't be suprised if there was no change either, or a regression.
I'm just in a wait-and-see mode right now. RJ is probably going to be around for a while.