Ok, it's something to ponder then, because it could lead to a "chicken before the egg" situation: potential stackers out of that time-window might get demotivated at starting because their windows of activity are out of sync, and thus their material statistically fail to catch attention. So they leave, and thus the public within that new time-window never develops. So there should be a way to flatten the ponderation bell of the ranking a little bit more so that it can overlap just well enough with other time-windows to help them to catch up.