Just a relevant thought since you brought up Granny the Good Baker (may she rest in peace), how often do we have "Best Baker" threads on T-Nation? This could be a reason why she isn't brought up as often as Bruce Lee.
While Granny may have been a great baker of pie, I doubt she was a pioneer, i.e. the first pie baker in the U.S. that taught non-pie-bakers how to bake with the threat of being ostracized by her peers. There are a lot of dead people that are discussed frequently.
People can debate how good a martial artist or physical specimen Bruce Lee was or wasn't. The fact remains that he started a martial arts trend in the U.S. by opening up the instruction to non-Asians when it was not cool to do so. He also was a pioneer in breaking with the traditional ways of teaching martial arts. Like him or not, he will likely be a topic of discussion for years to come.
Another thing for the flamers to come, regardless of whether or not he was the first to do what I've written above, he is acknowledged to be the first, much like a Spanish Jew is an Italian-American hero for discovering America when in fact he wasn't.
Did Granny do this with pie baking?