Reili
People are starting to assume that Shiro, Kuromi, and Nytri are incarnations of each other, I had already made that guess Dozens of chapters ago. Only that I thought that Shiro (3rd incarnation) was Nytri's (1st incarnation) RE-incarnation born from the corpse of her incarnation, Kuromi (2nd incarnation).
What if she is really Kuromi? I know you are saying that Kuromi is the 2nd incarnation of Shiro. Yeah just to put another meaning to it. What if she lost her memory as kuromi so when she woke up. So when she woke up what she remembers is her being nytri and not being kuromi while kuromi when she was alive she also didn't remember her past life as Nytri? How 'bout that?
Possible spoiler, at least if my guess is correct. It might be one of those situations where Both Shiro and Kuromi are the same person but the soul was split, First she was like a machine demon, Kuromi was a human. and now she's ascending to become a Goddess, Maybe? Maybe if Kuromi resolves her grudge they'll merge or whatever? This is my own theory.