To begin with the Tao of JKD was not put together by Bruce Lee and published as a finished work. They are notes compiled, put in order, and stamped together like one body of work, and published by his wife after his death. You find the rest of Bruce Lee’s notes published as several different texts by both John Little and Dan Inosanto. There is like a nine book red, black, and gold set by John Little, and then another set by Guru Dan, Ted Wong, and others that come in many different colors, I forgt the name of that series, its old and our of print, its called something like the Fundamentals of JKD or something.
At any rate, at some point in his notes you will find a list of '26 Fighting Elements of Jun Fan" and I dont remember kali, escrima, or panantukan being on the list. Dan Inosanto says in many interviews that he had barely exposed BL to the filipino stuff. In BL’s Commentaries by John little or the JKD Conversations book (a book of interviews with BL’s 1st gen students.) there is a quote from Dan Inosanto talking about how when he gave sticks to BL, he just picked them up and used them naturally like an escrimador. There is also the fight between BL and Dan Inosanto in the 2nd or 3rd level of the pagoda in Game Of Death, where BL uses a switch to defeat Dan Inosanto’s filipino sticks, implying the Fencing element in JKD was superior.
Most JKD Concept schools are some kinda CSW/Kali/Muay Thai thing. The basic opinion is that they dont need to delve deeply into other arts, like aikido. Aikido being a specially hard example, concerning the massive amounts of lore, lingo, and culture layers you generally have to sort out at most aikido sources, specially in the US where it is almost impossible to find any sort of good, working aikido in anytown USA.
Bruce Lee specifically was concerned with improving his martial and on-screen skills. It doesnt seem to have been his desire to document the ups and downs of every art he came in contact with. Meaning he didnt neccessarily delve as deeply as he could on each and every subject. The core of Jun Fan-JKD is fencing, wing chun, and boxing. Those were the primary subjects BL explored to their greatest extent (in his time) - nowadays for us modern folk, the primary subjects are different but similar. For a person like me in Reno, NV, there is not an aikido instructor within a good drive that could throw someone to save his life, let alone demonstrate much useful in an American Minute that would convince me to spend valuable training time exploring his raw-art at the expense of honing the stuff I already know is good.
SBGi defends their use of (Thai) Boxing, Wrestling, and BJJ as whole arts like so: Why re-invent the wheel? Training these three arts, even individually, in a resistance-orientated environment will give you applicable skills in all ranges of combat, so what real reason is there to seek out aikido or savate? The goal is to actually learn how to put a wrist lock on someone, not document the many different ways found in the world to possibly apply a wrist lock.
So maybe that helps you out, in short, you should read more then the Tao of JKD to find the type of info you seem to be looking for.
