The hips shift forward on the downswing of every good full swing that I have ever seen. I understand that some part of the spine might return to the same position at impact that it was at address. I don't care about that. If such works well in your teaching then that is great and I have no argument.
I read from your posts that you are saying that the hips only rotate and they do not move forward towards the target in the downswing. Is this what you really mean to say?
