Let me ask you this. Ever had your "riding hand" jam your opponents poorly angled attack by not even moving? Has nothing to do with skin sensitivity my friend...
With over 35 years of WC, I just might be able to do that. In this instant, what you refers to as "jamming" equates to wast of movement, not an economy of motion principle. How ever, I hope that I'm not too old, too close minded or too arrogant to learn some thing really new.
Instead of jamming, the "riding hand" should slide/slices in to attack, and you can't do that without knowing your opponent's positioning, you do that by touch/feel ... that sensory input is immediate through the receptors of your skin.