I mean, it's at least it does not follow the "You killed people and also I don't like you so die" troupe.
It's also refreshing that we have this kind of ambiguous morality: Is the MC being forgiving of his evil acts? Or just the world is a hard place and there are no rights and wrongs?
let me tell you about these "offbrand manga´s" about Impa and Link from breath of the wild i found a few days back.....
They are indeed a thing.....
But on a more serious note, its rare for this type of manga to have the first follower to be a old man.
Ysually its a cute girl / love intrest or a macho man who likes fighting and wants MC to teatch him.