It's hard to know what Bruce Lee really "thought" or even what he claimed. He died young, and most of his public efforts were towards his ACTING CAREER...
Pretty much all of the Bruce Lee body of work comes through the filter of his estate and his students, both of which had a very vested interest in him....
Whether it was just love for a dear friend they lost, or the fact a guy who was a phys ed and driving teacher became one of the richest men in the world, there is an interest at work
It is a touchy subject even in the so called "JKD world"... where half of them moved on the more progressive training while the other half has fallen into their own "classical mess"
But a few facts are apperent; (1) He wasn't the super fighter people want you to believe he was. Nor were his skills all that astounding. There were much better, real fighters in his days. His bag clip is sad. (2) Tons of people believe the ideas he stole were indeed his. And the estate backed that falsehood until they were forced to acknowledge it after losing legally (3) The claim that Bruce Lee or his ideas produced anything is hotly debatable. Bruce himself never produced many students. HIs ideas produced a generation (or two) of "Jeet Kune Do people" who have now split into widely divergent camps.