It seems to me that Inosanto has always had a completely different philosophy than BL. This has nothing to do with concepts vs. original just that one of the core principles of JKD is to strip away what is unnecessary.

Inosanto is certified in at least 3 billion arts. I don't know how many his academy represents, but the amount makes it seem like he is obsessed with learning every somewhat effective technique on the planet.

I don't mean this as a slight against him. The man has an insatiable appetite coupled with a great capacity to retain knowledge. I just think that he is very far from what Sijo Lee would consider a good example of JKD.
My $.02

Teaching VS Practicing

If you REALLY want to delve into different arts then have to LEARN them...lots of information.
If you just think that for instance SIlat has some cool takedowns, you could just borrow a few and move on.

Now...if you want to be a 'fully qualified' teacher teaching a full curriculum then you would likely need to KNOW lots of techniques that you might not use yourself.

I am studying to be a teacher.
In my teaching I would be very inclined to restrict the amount of information taught for the very reasons you brought up in your post.
BUT then you are limiting your student's options for them rather than letting them figure out what works for them.

All that said....
I have trained with lots of Inosanto lineage people.
They tend to be "DRILLMASTERS".
As you become a more advanced student, the drills become MORE COMPLICATED.
On days that we were focusing on a particular Art you would even do a different BOW and use the terminolgy.
You even see people wearing the traditional clothing from that art.

My Concepts teacher was the opposite.
Beginners-Intermediate do drills designed to teach Coordination and Technique.
THEN the Drills are SHORTENED into 2-5 count Entries/Crashes/Takedowns
rather than spending lots of time Toe-To-Toe doing 16 Count drills!

I still don't know the ANSWER to this...but I do know the QUESTION which is a start

jmp

I think Dan's emphasis is on the filipino arts because that's his base just like Wing Chun was Bruce's. But I think they touch on just about all the arts, which would definitely be interesting in a way to have it all under one roof. I think Mr. Inosanto is doing his own thing, which is pretty cool, but it has definitely diverged from what I think Bruce had in mind for JKD itself as a seperate and distinct art.

I agree with the FMA being Dan's core, but I guess my main issue is the old " if your training your front, your rear is weak...".

I don't believe you can ever master an art; martial or not. I personally would rather attempt to master a "little" than dabble in a lot.

I certainly don't mean dabble to insult Inosanto because by most standards he is amazing at the arts in which he trains but, think if he had put that much time and energy into only 3 arts. (He would probably be a Supreme Grand Master of Almightiness like Leung Ting).

This is just my personal philosophy of course, and who knows, Dan may have serious ADD / ADHD.