Some people think that Kura is the original aura of Rhue whilst Jeruh has been the dominant one. But I think there are problems with the theory if we believe at the same time that Rhue is "the Mimic".
So if Kura is also but one of many absorbed auras, maybe a dominant aura in former times, but not the original one, Kura's aura would have to be in Dream Estrana. He must not necessarily pop up in Ep.6, because Jed, too, did appear in Ep.5 but not in Ep.6, so I think the absorbed auras are not forced to show themselves to Rhue and can keep their privacy protected if they want.
My favorite for possibly being Kura is the man standing in front of the big windows in the concert hall who saw the Rolling Mists.
I think at first he mentions something interesting about the play, especially Rhue's role. I wonder if this is or is not good evidence, because there is one problem:
Rhue must have killed Kura before he ever got to know Kava, otherwise Kavax would not have identified Rhue as his former companion. This would mean the real Kura never learnt about the story with the witch Luma, the Guided etc. because his body already was dead at that time. On the other hand it's possible that the dominant aura kinda notices what's going on around Rhue.
So the idea is that Rhue/Mimic saw the Rolling Mists when he thought he was Kura, means when Kura's aura was the dominant one. If at that time the Mists were near the ledge at the current end of the Way, that would be an explanation why Rhue bears the ledge in remembrance that strongly (and mixed it up with the Landorin ledge). This would also fit in the fact that the ledge is near a potential place where Kura/Rhue/Mimic might have killed Kava and after him, the Guided (the Mystic Forest).
What are your thoughts on that topic?