[Mithadan]

JRRT appears to waver between two positions concerning rebuilding a hroa (body). I don't have the books available to me so I don't know which is more recent. He sometimes suggested that the Valar built the hroa. At other times, it seems like the elf does it. I think his latest conception was that elves, unlike men, have fear and hroar which are closely intertwined and that, in the event of an "unnatural" sundering of fea and hroa, the fea retains a "memory" of the hroa from which the body could be reformed. I suspect that assistance of the Valar is required so that one of the unwilling Avari could not re-incarnate in Middle Earth without assistance.