That is incorrect because I have been down this road. Among some of those that do teach publicly the USA, if you're curious try to find someone that learned (or has even seen) either Ohan or Paiho, not to mention any thing else. Ask questions. You'll be surprised. There are more kata that are contained in the system, various categories of martial strategy and technique, health and wellness practices and other "things" that make the system an obviously chinese based martial arts system, as opposed to a "style" of karate. There are techniques, waza, kobudo, and several sections of study that make the complete art of Ryueiryu that were not taught to members of his era by Nakaima Kenko Sensei. I actually spoke with highly regarded people who told me that Campbell actions speak for itself. He is the only fully licensed American and Bearer of the entire System. Research it, I also believed the way you did not to long ago.