I teach it from white belt. This may be quite different to other schools but I am proud of my students of all rank in any company. Your assertion is valid within your own experience but you are welcome to visit my school any time.Please inform me Ballen. If it is taught why save it for high ranking belts? That should be in the syllabus from the beginning not at the end were it does no good. I have done more then enough internet research and talking with various karateka in real life to make my assertion..