People often have different criteria. Depends on what is important to them or what standard they go by. Some consider Bruce Lee to be the greatest martial artist of all time. Others do not. Different criteria.I have to say that either you do not know many martial artists outside of TKD or that your definition of accomplishment and mine are quite different.
I would add Jhoon Rhee to that list as well.So again I submit the following Koreans who have accomplished what Choi did: Mas Oyama, Hwang Ki, Cho, Hee-il, Kim, Joeng-ho.
Lets not forget Chuck Norris, lest he read this thread and realize he was slighted.Now the following non-Korean martial artists: Fumio Demura, Morei-Ueshiba, Gichin Funakoshi, Bruce Lee, William Cheung, Yip Man, Remy Presas, the Gracies...The list goes on.
Daniel