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Felix' change has been the one baffling constant. Yet he doesn't use it in Pedro-like fashion, punishing the hitters allll niiiiiight loooonnnnng for cheating on the FB.
Dave Allen has also mused over why Felix' change should be so effective, even with so little separation and even though its separation and movement are DECREASING over time.
Felix' change doesn't seem theoretically awesome, but it is in practice. Maybe because he leans on his FB so much.