It is a common misconception that JKD is assorted techniques from various arts, it’s not. JKD is primary WC,boxing,fencing. The 26 some odd arts that Bruce was looking into were only to observe their strengths, weakness and how he could use his JKD to inter/intercept. Can you teach yourself martial arts? For the most part, what I read from those close to him, Bruce was primarily self-taught.