Of course it has a massive affect, at least to those who don't have very good technique now (which is most people but not all). That is the whole idea. If it didn't have a massive affect it couldn't possibly have a massive affect on the outcome, which we see.

The question though was on the mechanical constraint and on both cranks the foot is constrained to move in a circle. Nothing prevents the muscles, when on regular cranks, from using the exact same coordination as they are "forced" to use on the PowerCranks. That is the whole idea, to change ones natural way of pedaling to this technique even though to an outside observer both look the same because in both instances the feet move in circles at a, pretty much, constant RPM.