-Gaster will no longer be part of the story.

-Sans will not be able to convince Papyrus to not trust the human but Papyrus will realise his mistake after checking up on Sans and his station near the ruins,he'd walk in on the very last attack when Sans is tired.

-My thought of how Papyrus will look in his own fight(Phase 3 technically)he'll be holding Sans' hoodie and dats it.

-How will Sans remember about the other genocides:After every reset Sans would still be able to keep a bit of his memory from the previous timeline,he'll realise slowly that those "Nightmares" are previous timelines.

-Is it too Fanon?yes and idk what to do about it.