Lots of stuff here. I'm on the run, so I'll just address two points.
Actually Bruce didn't know very much at all. What he had was incredible physical talent. Bruce began studying the arts as an extension of his dancing skills, to learn how to fight. he began Wing Chun training around the age of sixteen. By the age of nineteen he was a college student in Seattle Washington, and his own teacher. No one in the Traditional Chinese Community would deal with him because he was so cocky and somewhat disrespectful. So he bounced around learning what he could from established master like Ed Parker. When Bruce gave his famous demo at the IKC, he was 24 years old. Parker had been a black belt since 1953 in 4 different arts, studying since since he was 9, and had reputable teachers, and collaborators the entire time, including his original kenpo teacher, Kwai Sun, and Sijo Adriano Emperado.
Yes they can, if you have the knowledge that drives the physical attributes. I may be built like a linebacker, but that don't make me a great tackler.
Close. Maybe they don't know what they know as well.
"The more you know, the more you know."
Bruce liked to exchange ideas with many other martial artists; it isn't as though he sought Parker out to learn kenpo. In fact the way he came to know Ed was via a mutual friend.
And to set the record straight: Parker started martial arts training at age 12 in the art of judo. Bruce was introduced to Yip Man by William Cheung in 1954, making Bruce 14 when he started training in WC. According to Cheung, Bruce progressed so fast the the other WC "masters" became jealous of him (no doubt Bruce's cocky attitude had a lot to do with that) and looked for a way to force him out.
http://www.cheungswingchun.com/g/1472/the-bruce-lee-training-secret.html
"Sonny Emperado has unequivocally stated that the first time he met Ed Parker was when Ed was in the Coast Guard and trained with him for two weeks in 1952 before Ed Parker went to train with Professor Chow. "
http://kenpokarate.com/1949-1954.html
Furthermore, Parker was a 3rd degree black belt in 1961. Yet, four years later in 1965, he signed Mills Crenshaw's 4th degree rank certificate as having 9th degree rank.
http://kenpokarate.com/ikka.html
Parker must be the only man in the history of martial arts to magically climb 6 belt levels in only four years. Not even McDojo TKD schools offer that.
And in any case, at least Bruce didn't BS about his background, claiming that only he and he alone was shown secret techniques by his sifu, while other more prominant and higher ranked (and personal friends) of his sifu know nothing of these secret techniques. Kind of like some people have done with Kenpo since Ed Parker's death. :BSmeter: