Well of the three brothers Toki was always seen as the fastest and most graceful, a sick and dying Toki was able to startle Souther when he heard he knew his secret. Healthy Toki was above both Raoh and Kenshiro. The dude made his own version of HSK and created his own moves like the aerial Hyakuretsu Ken. Have you seen him in the HNK ps2 fighting game? He's pretty beastly and a top tier character if not the best. If Koei pays attention to the source material then Toki should be one of if not the best character. Not the Lu Bu of the game, as in the hardest to beat. Do you get what I'm saying?
Pay attention to the top-left corner. That special move he does when his opponent is in the air and he dashes by them, yeah it doesn't matter how high or low you are, if you're caught in a combo that move hits and does a good amount of damage.
Toki was even faster than Souther in this game. For Souther to be faster than him you had to use one of his special moves that granted him 2x speed.