yeah the main methods of attack are used first.. foot and hand techniques. later you can add knees, elbows, head, or whatever you like. the way jkd was started was to take down your opponent by any means, not necessarily by only one certain way. in lee's method, he always said every type of martial arts should be merged into one, kind of like what he was doing in jkd. the downfall was to stick to only one or a few methods of attack such as only grappling/throws, hand techniques only, or leg techniques only, etc etc. there were only a few "clans" that he liked which included tai chi and aikido but the reason for those were because of the fluidity in movement and flow