Funny that Goju Kai isn't being considered GOJU-RYU. Just like any of the Okinawan or Japanese schools of GOJU, there will be some slight differnences. You can see differences when comnparing Jundokan, IOGKF, Meibukan, etc. Each of Chojun Miyagi's students came away with something a little different. Although I may be GOJU-KAI, I've been solicited to join Okinawan GOJU organizations more than once. The main difference I see with GOJU-KAI, is that the style is molded to the student, as opposed to the student having to adapt to the style. I find this as a plus in GOJU-KAI. This way one person with a particular extreme body type (tall, short, stocky) can adapt well.