So that man that's blind and really old, that later on dies, in the shogo arc.. he's the man that people though died of the seijuro hiko 12th, am i right? and that man taught shogo his techniuqes... but that man failed the test of the amakkeru thing and fell into a river.... so that's why shogo's dosen't have the real hiten mitsurigi.

Actually you can see hiko seijuro 12th in episode 67 when he's fighting Nishida who's shogo's master.. he looks like hiko seijuro the 13th...