I think that there is no doubt that he definately practices the"Art" of jiu jitsu and is more interested in spreading it now (that his fighting career is done), and as kevin said, he "gets it". There was another post I read where he referenced taiji as an influence (as Robert mentioned there is bound to be overlaps with IMAs). As a point of interest check out this video of his son Kron from a Seminar a few years back where he echos some of his fathers philosophies:
http://www.youtube.com/watch?v=nFiR3-nDKww
Mark.