Since when does "Rhue" split in two? It seemed to me that in that ending, he completely dissapears from the 'real' world.
I must admit that was my immediate belief upon playing that ending, but why would he leave the dream world in order to get to it? The dream world is in the sword so he shouldn't need to fly to get there.. And the whole point was that if he left then Lexus would be gone..
If the sword you see at the end is Night Reaper, then Rhue and Kloe could be standing before it in memorial of Traziun.. Which would explain why Kloe and Rhue wasn't there in the Lexus ending.
The other make up of the personality that has a soul, stays in the real world and and basically loses his Jeruh side... and becomes totally badass. And probably evil.
I may be wrong but it sounds like your saying that what is left outside is all the other auras (Midian and such), which he has absorbed and replicated into Rhue's personality.
The thing you are calling Jeruh would then suddenly lose a big part of his personality while in DE, he should basically suddenly turn into that guy that was stuck up in the tower... Just with some more life experience.
What he was in the very beginning, Mimic or whatever.. Must have had an original personality and perhaps original aura. I think that the burden of too many absorbed auras perhaps displaced this original and created the new personality built up from one dominant (Jeruh for most of the game) and a mix of the others. When this new personality goes into the DE I believe that the Rhue left outside reverted back to its origins (which was only a small part of what made up the Jeruh that stays in the DE).
Unlike all of the previous personlities that control this body (like Midian), the Rhue at the end suddenly understands its existance... That it has no end and can suddenly fly. I would have thought that is suggesting who is controlling the body now