Heh, I thought it was 27 styles...
Many thanks for your compliments, Jim. Now stop, you'll make me blush

I appreciate all the feedback you've given. It's great to bounce my crackpot ideas off somebody 'in the loop'.
I was aware of the influence of all those systems, but: 1) can't remember the names of all of them, and 2) wasn't crazy enough to list them
I did neglect to mention the Tao of Chinese Gung Fu, but most people claiming to teach JKD either mention Jun Fan and/or JKD. I think DeMile teaches "Tao of Wing Chun" or "Tao of Wing Chun Do" or somesuch. Does Glover call what he teaches Tao of Chinese Gung Fu? I forget.
I like your weapon systems comparison of 'original' JKD with what I'll call 'modern' JKD (modern just to differentiate the two regarding to time/era). So much has changed in the near-30 years since Lee died. It'd be like the U.S. military teaching their pilots to dogfight with Sopwith Camels, neglecting the advances made in technology and piloting theories since WWI. Sure, the basic concepts may still apply, but things change over time, and the techniques and methods must change with them.
I
wish I could intercept with a high hook kick! Oh, and as an emphasis on how things change, I'd like to point out that in the Tao of Jeet Kune Do (published in '75), Lee's hook kick is what is now generally called a roundhouse and his reverse-hook kick is the modern hook kick.
I think a big factor is that Lee is such a HUGE icon in the martial arts world. I think some people think that in order to sell themselves as JKD teachers, they have to make themselves as Lee-like as they can. Another factor is that many of them can't seem to move on as Inosanto has. I may be a pontificating geek, but as Lee said:"...it's like a finger pointing the way to the moon...don't concentrate on the finger or you'll miss all that heavenly glory." In my eyes, the people sticking to 'original' JKD can't take their eyes off that finger. Dan's been walkin' on the moon for some time, though.
However, in my mind, and I'm sure it's the same for most serious martial artists, when someone mentions JKD, the first name to pop into their heads is Bruce Lee. Right after that, Dan Inosanto. People can say they teach the EXACT curriculum Lee taught in '68, or '70, or blah blah blah, but they can't ignore what Inosanto has done since Lee died. JKD would not be where it is today if not for Inosanto.
Hmmmm. This may be a bit disjointed, since I've gone back over and added stuff without editing the stuff I've written previously. Oh well. I'm sure you get my point. That, or I've simply rambled on again. Must...think...linearly...or...shut...my...damn...mouth...
Cthulhu