"Anonymous. So in your last paragraph 10. 6.09 you are agreeing that we do not have two feet flat on the floor at the same time."
Not exactly. The general concept is sound, but I pointed out there that we actually do often have two feet flat on the floor at the moment of passing.
"Why not just admitt in simple language that you were mistaken."
Because I was not mistaken. Granted it would have been better to say "foot" rather than "feet" but there was no mistake in the message.
"To get back to the lowering on the 4th step of the Progressive Chasse or the 4th step of the Lock Step. Dont all of the technique book say that we lower at the end of step 4 and that none of them say we lower into that step. Yes or No."
First of all, you must realize that the technique book is only talking about the timing of the loss of foot rise - the actual descent begins before that. However, literally applying the technique book's foot lowering timing is not compatible with the size of today's dancing either.
You will never learn to dance until you realize the difference between the technical language and the practical execution; especially the practical execution necessary when your goals grow beyond those envisioned by the technique books. Look around in the real world of dancing, and you will see people moving much more elegantly by lowering out their foot rise earlier. If instead they kept the foot up as you want, then they would have to disrupt the path of their movement to wait for it to lower, or simply not lower very much and not move very much (as was the practice when the books where written)
Yes, there are situations when you can lower a heel too soon, but in reality the problems caused by lowering it too late (or not at all) are much more commonly seen. This is perhaps because many of those who might fall into the lowering the heel too soon mistake have instead been allowed to self-disocover a method of casual dancing that doesn't use the heels at all, but only the ball of foot and in some cases toes. As a result, the lowering the heel too soon problem tends to turn up only briefly - when someone has a teacher who is insisting on foot usage, but hasn't quite mastered the body mechanics of it all yet. In contrast, the lowering the heel too late problem plagues a category of dutiful students who keep trying to do exactly what people like you are telling them they must, despite the fact that it is not compatible with the overall dynamics of their dancing.
To be a dancer, you must learn to gauge the practical dynamics of movement in your own body. A technique book can be a source of ideas, but you must also look to today's active dancers. When today's dancer differ from the technique, you must use your own body to experiment with both methods and discover which is more advantageous for a specific goal. This is the life of a dancer; the life of an armchair expert is a bit simpler.