I hung out after class yesterday to hit a bag and pay attention to my foot/hand timing. Realized that in general, my foot is there before my hand, rooted for me to punch (on a bag). When I add in more footwork, ducks, step ins, etc. they occur at the same time. Even when I do a kick-punch combo, my foot is landing generally with the punch. I also realized that for me, I need that for power. My power (how I conceptualize the way my power works), is starting from the foot, and working it's way up through my body; so my foot, hip and shoulder all need to be working together when I make contact. I couldn't really find a way to do that with my foot landing afterwards. It may be different for those who generate power differently, but I can't see how the little bit of gravity is worth sacrificing the power coming from the foot movement.