>>22966556
Rich woman who loves mystery novels, is secluded from the world, is rich but her family is nowhere to be seen, decides to adopt Battler (instead of, you know, handing him to the authorities) and writes together with him mystery novels and then forgeries of the Rokkenjima massacre. It really does sound like Sayo, if you put it like that. More than that, a random character with all these characteristics is slightly dumb, knowing Sayo already exists (or existed). Not like adopting new personalities (and witches forms) is a new thing for her.
The supposed connection between meta stuff and the "real world" also implies Ikuko has to know the truth while Battler doesn't, since EP3 and EP4 include Shkanontrice, but Battler only reaches the truth in EP5. Manga has that Confessions of the Golden Witch stuff, but something that convenient, really?
Ikuko could had also written EP5 alone (hence Erika's introduction, who is the self insert of her cat), with Tohya reaching the truth after reading it (the tea party). Then EP6 would be Tohya's work alone, understanding who Ikuko is (was) and allowing her "resurrection".
Also, Battler "dying" but not actually dying and Ange "dying" but not actually dying, at least opens us the possibility of Beatrice "dying" but not actually dying, since they are the three MCs aren't they. The final scene (Battler and Beato in the boat) could be easily interpreted that way. Battler says he won't let her die, after all. The manga scene with Beatrice in front of a Battler without memories fits too well with Ikuko finding Tohya too.
There are some other circunstancial stuff anons point from time on time. I don't like italian anon's take on it in general (nor his nitpicking of screenshots), but I think he said something about how Ikuko says to Ange she never read something not written by herself. Which really fits with how, even if she knows a lot of mystery books, maybe "Ikuko", the new persona, never read something not written by herself after all.
Pros: the "real world" part of the story and its connection to the meta stuff (talking about Tohya/Ikuko's writing) is way more easily understandable that in other theories, it gives us sort of a happy ending, and it does has some clues pointing at it.
Cons: not sure how Featherine actions fit in all of this (although I guess getting to know so much about Sayo might be a clue too), and some people think Sayo not dying is out of character and ruins the message.
There's also the "weird timing" between Battler drowning and Ikuko finding him being already another person with a car and a mansion and all, but we really don't know enough about the circunstances, in my opinion. Battler could have been in coma for years for all we know. As for the money, it's not THAT farfetched that she had some properties or something already bought just in case as some people think. I mean, Sayo DID have a boat with gold in it as an escape route. Why would she need those if she wasn't at the very least considering the option of escaping together with Battler (or George or Jessica) alone? If it was just about someone surviving the explosion, Kuwadorian exists, after all.