You are talking about how Mother talked to Ella about how Ella failed to get Mother's powers. Mother says "Failed, but suitable to birth" and that is about MC. Ella is Mother's heir but she is Father's heir. MC is accepted by both.
And if you ask Aglæcwif about "Tell me, what is the greatest power", she talks about how Order is the greatest power. To have both the Power and the Authority to enforce. And "She has never met any being who has acquired both since the origin." She also says that she heard from Ella about a potential inheritor but she says that it failed. I don't know if it's about Jake or MC, or that if Ella really protected MC by lying but it's a fact that only MC has the traits of both monters. And Aglæcwif says obtaning two traits from the numbered, claiming one of the original powers it will lead to a spawn that is unfathomably powerful.
The numbered comes as twins. The 1st is "The Authority" and the 2nd is "The Power". They are the firtst set. Second set is the 3rd, "The Body" and the 4th, "The Memory". When Aglæcwif talks about a power called Order, she is talking about a spawn of the 1st and the 2nd. And MC is the spawn of the 3rd and the 4th. A spawn that was never seen before. And through out the first part of the game, both the 3rd and the 4th talks to us about how "we" don 't take orders from the the 1st.
I'm off topic now, sorry about that. What I wanted to say is, when Ella talks about how she is not the one afterall or when she says to MC on one of the dead ends about "so you were already perfect from the beginning", she is talking about having the powers from both twins, not just one. Ella has the power of the 3rd, and she is the heir as 3rd has accepted her. But 4th has rejected her as Ella does not have the powers of her and didn't get both. But MC does, and accepted by both 3rd and 4th.
But I have absolutely no idea what or who the eye that speaks to MC during dreams or evolutions is. Is it the Order that Aglæcwif talked about? Or is the something other than the Order and has a different name but one that stands on equal grounds to Order? Is it one of the original powers, or is it "the original" power? No idea, still waiting for the definite answer.