The way I've heard taught latest, by Robert Royston, Kyle Redd and a few others, is the step moves the center. Think of it this way, the "center" is a theory, you can't find center in any medical book about muscles or anything. Center as we refer to it, is our center of ballance. As a lead, you center can't change on the first count of any pattern, untill a step is being taken. Why? well, because if you stand still, and you are in an upright position, and then change your center without moving your feet, you will fall. Control is the key to movement, weither it be dance or any other movement. As a follow, as you said, IS a bit different. Because as a follow you are actually reacting to your lead's movement. As a couple, your center changes when he moves.......thus pulling you off of your center (this is getting deep, lol) causing you to react (in this case, step) to maintain/regain your center. I give credit to Robert and Kyle for this explination, as this is how they explained it in a question answer session at Bill Robinson's swing event in Atlanta a few months ago. For a lead, moving before the step, or anticipating the step is a bad habbit, and I'm struggling with that one. I didn't even realize I was doing it untill Laureen pointed it out to me at Bill's event. If any of you ever get a chance, take lessons from her, she's a great person and easy to work with..........as well as Robert, Kyle, Ronnie, etc etc etc.