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I don't see your point.
Moyer hit a wall TWICE with velocity. Once from '99-2000. Then he figured out how to pitch around it the following year.
The second time he hit a wall in '03-04, and never recovered.
Moyer's case seems to suggest that velocity IS important even at the extreme low ends.
I'm sorry but I'm not buying this 83mph is the same thing as 87mph junk.