A few months ago, I worked out a little bit with some friends who are Kajukenbo practitoners.(I used to train at their school years ago, but only for a few months.) When one of us would demonstrate a technique or concept or idea, the other would show where it fit in the other system. Everything they showed me was in American Kenpo. Everything I showed them was in Kajukenbo. I mean everything. Now, I am just a 1st Black in AK, so don't get the idea that I think I know everything in AK, because I am well aware that I know next to nothing in the big picture. But there were so many similarities in the concepts, that it is obvious that the roots are very close. And, even though many of the concepts were the same, our styles of movement looked very different at times. Just my $.02 .