Speed from punches doesn't come from natural abilities as much as that comes from training at an early age. Any fighter who was destined for greatness, so to speak, because they started at such an early age and trained hard are those that posses the hand speed. The track records don't lie.
Reflexes are somewhat of another story, ala RJJ and whatnot though.
Speed can be developed like most anything else, but it will peak based on inherent genetic potential (similar to power - technique and muscle mass can be added to maximize it, but it can't be increased beyond a certain point)
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