He used shinto magic to separate himself from causality. Therefore, he will ALWAYS exist, and time paradoxes don't work on him anymore. Killing his mom won't do anything because even if she dies, he will still come into existence because he has made the declaration that he WILL exist no matter what the rules of causality says, and causality caved first.Confused but okay.
when he was with miyo he mentioned court officials wanting their children to train under his apprenticeship, and when reminiscing about ozuno he mentioned many would ask him to train them but lacked geniality, which is why he picked ozunoSo, just as he doesn't view Shirato as his mother, he doesn't view En-No-Ozuno as himself. Moreover, he believes our Ozuno to be the worst disciple he's ever had. Was this the first weft that Kozumi tried to train himself? As, it's been a while since I read the full series, but why was he trying to create a second version of himself? To cover twice the ground?
He is the child of the oni blacksmith woman and that priest, so technically a "hornless oni".They glossed over this too quickly... what do you mean hornless oni?