Part Five of Darkmans

I am currently on part five of Darkmans by Nicola Barker, and the plot just keeps thickening, and keeps adding more twists and turns. I would like to make some predictions as to what will happen in the latter half of the book.

For one thing, I think that the John character is the man Dory becomes when he is not himself, which is why he does not recognize anything, even his wife, and why he is crazy. Fleet is aware of this, and Elen is at least aware that he is not himself at these times, because she gets very upset when Fleet calls Dory John. Peta and Ann are somehow in cohorts with John, perhaps having something to do with the mysterious painting. And perhaps the main character being the past is actually refering to John, who is from the past. John is also abusive to Elen. We learn this when Fleet tells Charles, "No. He's not my friend because he hurt my mama." And then, the assurance of the fact, when "Fleet pushed up the sleeve of his mother's jacket, revealing the fading ring of bruises around her wrist." The only thing that confuses me on this topic, is if Elen got those bruises from Dory while he was John, what was she doing hurting herself with the lighter in an earlier scene? And why was she hiding the trian schedule from Dory in the first place?
Since I'm pretty sure that the special thing about Gerry was that she had some STD, that leaves Kane, Gerry, Gaffar, and Kane all as insignificant characters in regards to the past. However, I don't think that they will end up as such, or maybe they will represent the future overcoming the past in a necessary advancement. If so, why is Fleet, certainly, as the more youthful, the more future representative, more involved and aware of the presence of John and the past than any of them? Kane is catching on when he witnesses the dark bird, but he could have been halucinating, or thought he was. We will just have to wait and see what roles these less informed characters have to play as the book comes to its close.