About TKD and numbers......
Gen Choi "created" TKD in 1955 and it spread like wildfire. I'm sure that this is in part to American Servicemen serving in South Korea.
TKD has been and entry point into the martial arts world for many of us. You will find a lot more "former" TKD students in an Aikido dojo than former Aikidoka in a TKD Dojang.
So for the sheer numbers of TKD practitioners and THIER impact on the martial arts world I'll have to cast my vote to Gen. Choi as the most influential martial artist of the 20th. century. Of course it's all open to debate.
what you do,
when it counts.