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I follow your argument, I just don't see where you get this idea that we "ease off the pedals" when that isn't how pedaling works.
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We do not apply constant, unvarying pressure on the pedals. We ease off, what else would you like to call it?
Not stop, not go backwards, not apply zero pressure, but apply a pressure less than the maximum we apply in some other o'clock of the pedal rotation.
In the lower right, compare the four o'clock position and the five o'clock position. Four is maybe about the maximum, in that pedal stroke, and five is --
less. That's all I'm talking about when I say "easing off on the pedals", and according to those strain gauges, at least, it is indeed how pedaling works.
Mark has a suggestion that, as the frame un-flexes, it can help the opposite leg through the back part of its stroke, but given that the un-flexing retards the motion of the leg we're looking at, and the BB spindle connects the two cranks, I think we have to rule that out too.