In 2002, the "dominant concept" was presented as "jutaijutsu", with material from Takagi Yoshin ryu (a samurai jujutsu system from the 1600s) as the primary vehicle. People, and there were a lot of them, who adopted an "omote" or external focus on learning the kata and waza missed everything, as what it was "about" was conceptual: A couple of the key points in "the meaning of jutaijutsu" as Soke was presenting it are:1) Nothing you do should require any more physical "effort" than it takes to merely move your body through empty space without a training partner or opponent;2) Your partner/opponent should not be able to sense/feel/interpret what you're doing until it's too late (if at all!).