Sensei Katsuhiko Shinzato appears in a relatively new book and video. You might be able to order it many places, but I found it at the Budovideos website. Here is the link:
Several other Karate senior instructors are also in the book/DVD. There is a nice section at the end of the DVD focusing on Shinzato Sensei and his methods of moving. That section was filmed at his dojo.
Charles C. Goodin