[ Wait, hold up... this is a lot of sort though. ]

But then he's not the same person, right? I mean... [ This will be easier if he uses visual aides. Right hand index finger = Tsukiyomi. ] Amaterasu's brother... Tsukiyomi? Was here and then vanished.

[ Right hand finger goes down, and left hand index finger = his replacement goes up. ] Then somebody new showed up and got assigned to be Tsukiyomi for awhile. [ Then the left hand finger goes down too, and he's left with two raised fists but no "people". ]

So is there a third person doing that job now? [ Right- hand finger goes up again. ] Or is her brother back?