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I can see the logic in regressing players without a suitable # of PAs.
That said, I have some problems with using a blanket rule on a pool of players to evaluate an individual player's skill set. You might as well regress Ichiro and Figgins to a .300 BABIP. Our team is full of players whose splits are anything but normal, and many of them have been around for a while now.
I do think this team will be at least 40 OPS points stronger vs LHP come June. The only regular whos consistently stronger vs RHP is Figgins.