Parker stripped away the tradition in the instruction by creating a comprhensive set of analogues that was being "traditionally" taught by rote. The hope being that students would intuitively understand why they were doing something via the context of the technique. As per tradition most students created dogma in the techniques and ignored their sublime value. As with rote practice of basics in what we might condescendingly refer to as traditional arts the system has hijacked the value of the lesson it was designed to teach. Doesn't mean it isn't beautiful when you get it but it's just another way of teaching what's been there all along. So no, he didn't evolve.
but that's just my opinion I could be wrong.
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