Well, well. Just as I thought I got all the answers I was looking for, I noticed I must ask some more.
So, if we leave the weapons, multiple attacker scenarios, focus on 'escaping the situation' and those aspects not found in typical MMA curriculum out of the question, and just focus on the basic one-on-one training session and techniques, how much does JKDU differ from the typical MMA system of MT+BJJ+SW+Wrestling+whatever? To make this more precice, how much of "the usual Bruce Lee/JKD/Jun Fan" stuff is in the JKDU system to distinct the one-on-one techniques from the "common MMA techniques"? I hope you get my meaning, it is hard to phrase it just right so there'd be no need for further clarification...