Hmmm, it must work because any WCS dance I go to, we are all stepping at precisely the same time unless we are playing with rhythms for some reason. I guess what we often refer to as the beat is actually the attack and not the interval. If we talked about a beat being 1/2 second intervals, I would say we are supposed to be aligned over our feet on the second or the very beginning of the interval. Is that what you would say as well? So I would say our body motion should bring both dancers aligned over their feet at 2.0 and not a situation where the guy gets there at 1.9 the lady at 2.1 and the hands at 2.0. I think even with a mear .2 seconds difference, the two dancers would look out of sync with each other.