they cant , they are too large,so they massage the prices and take pieces off and add, both directions, rare occassions that they dump or add in size, not that rare but only a a few times a month and not on a monthly basis
these small bell curves are the ports between 95 and 74 ,may churn ,bounce off of those nips cleaves ledges on its way like a pinball hitting bumpers on the way down
they are managing billions, trillions collectively, you just want to find a way to track them, spot footprints,that the idea with MP