I could edit my last post... Â and it seems odd to respond to my own post, but this is appropriate.
I've just finished rereading chapters 1 through 10, in one go, slowly, letting it all soak in.
The structure is right. There is no need for a third point of view after chapter 3. The clues are all there, but very subtle. There are a few puzzling details -- I'm puzzled Jona, by some of your choices, but perhaps they well all work out. This story is written by Jon (or John, his name changes) and Sharra, although the Introduction hints that others may contribute in later chapters. It seems unlikely that the external force that propels Jon and Sharra together, would ever record their thoughts in this journal, this story.
Whatever it is that brought these two together could always remain an enigma, a shadow at the edge of their understanding. This would, perhaps, be perfect.
And now a question: When will Jon ever learn to cook without burning his dinner?
Scotty