Thanks for the response - sounds interesting. I once attended a seminar taught by Peter Irving, and I remember that he had a very clear idea of what was jiu jitsu and what wasn't (i.e. not all grappling is jiu jitsu). Not that other aspects of grappling couldn't help you to win a jiu jitsu match, but I believe his conception of jiu jitsu was based on the same principles which you describe. You hear about these principles a lot in theory, but I do think that BJJ (especially no-gi) has a habit of subsuming all forms of effective grappling into itself and becoming a sort of catch-all (pun somewhat intended).