If the cranks push your foot around at any point when you're actually pedaling, not waiting around or slowing, then you're doing something very badly wrong. As in, cannot ride a bike at all. That's the main fallacy of the schlerojunk. It just doesn't happen.

When you get on yer FW bike after the FG, do you find yourself coasting when you're trying to accelerate?
Thought so...

Even if it did happen, it'd suck energy out, not add more.