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And BTW, let's be careful too about getting *too* confident tossing around those Fangraphs velo averages.  :- )
Two different pitchers might have 87.6 averages, but one of the guys might be able to hit 90-91 when he wants (perhaps Jarrod Washburn).  He keeps hitters more honest.
Another guy really does have a hard time getting over 88, and hitters sit "in between."
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Also, those averages go up and down.  Pitchers can and do gain/lose velo month-to-month, like RRS.
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Also, the P/X data often doesn't call the pitches correctly.  A hard slider might be called a FB.
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87.6 might mean one guy doesn't have a respectable fastball, but another guy does, and likes to take a little off, vary his pitch speeds.
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If we're going to use FBv constantly, let's pair it with "top velocity" or something.  FBv can be pretty misleading if not kept in context.