@danbruno we know less about the church than about ourobouros but in the case of the latter I'm pretty sure not everyone has seen everyone. Like they all gather in the celestial globe and have the option to be anonymous and I think many of them just retain anonymity. Like, Campanella does not actually see anyone in Star Door 14. I think Anguis identity is on a need to know basis even for other Anguis (otherwise vita would've ratted them out I think)
@danbruno and not that this necessarily confirms anything but the JP voice actor for Nielsen in 3rd is apparently the same voice actor for the first Anguis (and also, uh, Tita's dad)