I'm an ITF (TKD) guy and it was all I knew for over a decade before I met Derek Stewart. He introduced me to other styles, to include JJ (this is before he got into 10P). Ever since, I've been trying to do what this guy has done, but I operate in a very close-minded style of TKD. So I began teaching it in my curriculum anyway and have been a black sheep ever since. At the time, I only knew the basics, but felt it a disservice to my students not to teach them at least that much. So I know where this guy is coming from and give him mad props for taking it as far as he has.