Sensei George Donahue of Okinawa Karate-Dō Shōrin-ryū Kishaba Juku, analyzes and explains intermediate moves of the kata, Wanshu.
Here is an excerpt from Wikipedia en.wikipedia.org/wiki/Sh%C5%8Drin-ry%C5%AB_Kishaba_Juku#Training_Methodology:
The training methodology developed by the Kishaba Juku was profoundly influenced by the natural ability of Seigi Nakamura. For many years Kishaba, Shinzato and their students worked towards reverse-engineering Nakamura's natural movement. They did this because what appeared natural and effortless to Nakamura was difficult to teach and it was important to preserve that ability for posterity.[1]
They developed a distinct training methodology focussed on body mechanics to make it easier to learn the elementary components of each move. This method of training has made Shorin-ryu Kishaba Juku distinctive and easily identifiable.
George Donahue of Fighting Arts magazine observed:
"Nakamura-sensei preferred to call the "hidden" moves "intermediary" moves, because they occur between the obvious-to-the-eye basic moves, and because they are not exotic or special, but are just a little harder to catch. The key to catching them, by the way, is to watch the koshi (pelvic carriage) and hikite (pulling hand) carefully to penetrate the sleight of hand."