You are reading me wrong, I'm not "changing my ideas." The power isn't necessarily generated by the upstroke, and I never said that it was. But the upstroke is crucial in keeping the momentum of the pedalstroke. Pulling across the bottom and up are both important.
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Good enough, I think we can both agree power-generation on the up-stroke isn't a large factor in power(note: not cadence)... one of my qualms with what was understood earlier.