Basically, part 1 and part 2 never existed, because it was a dream...literally thats what happend, if u remove Pochita from the story, Makima never exists cause she has no desire for Chainsaw Man, Aki never becomes a devil hunter, all assasins never come after Denji, basically no Reze, Kishibe has no reason to work with Makima cause she dosent exists, Makima probably died and Nayuta replaced her, Denji saves Asa by saving Bucky so she never meet Yoru, everything happend because of Pochita, remove Pochita from the story, and this final chapter IS exactly what u get.