It's even worse if he goes full pedophile on us... the storyline is quite sick as it is already, and that Murasaki wasn'ts to get into his pants, and he doesn't seem to mind at all.
You've never been around kids, have you Munsu? They'll often talk about things they don't have a full grasp on -- in some cases an adult should correct the child, but sometimes its better to leave things be and not try to confuse them further. They'll understand complex things in due time.

As for Shinkuro -- his strength seems very hard to scale after this last fight. I think the director was trying to force the story in a certain direction and ended up butchering the character.