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We need an outbound radar gun on balls in play that captures the vast majority of game action.  That begins to close the knowledge gap on how much influence pitchers have over BIP, and also how much value defense brings to the table.  A GB pitcher who gives up 110mph smokers but has a GB% of 60 looks BETTER (using today's information) than a GB pitcher who gives up 80mph bleeders at the rate of 55%.  Same goes for flyballers.  If a guy gives up 120mph cannon shots to the OF 35% of the time, is that more valuable than a guy whose average velo going to the OF is 105mph 45% of the time?
We have PitchF/X.  We need outbound velocity now.  If we get accurate information on how HARD hitters are smacking the ball around, it will begin to clarify the defensive debate.