Outside your system makes it harder, that's for sure. But I agree, it's good to get out of your comfort zone. 
Dead: Takeda Sokaku
Living: Edd Sorenson (Edd is one of the worlds foremost cave divers. If you don't think that counts as a martial art, then all I can say is you've never dove a cave...)

Dead: Takeda Sokaku
Living: Edd Sorenson (Edd is one of the worlds foremost cave divers. If you don't think that counts as a martial art, then all I can say is you've never dove a cave...)