This is just conjecture but what if Elidibus isn't the one who took Zenos' body and the person who actually took it was Lahabrea? Just out of curiosity do we know without a doubt that his aether was completely wiped out in the final battle with Shinryu? IIRC Lahabrea - > Thordon -> Estinien (Nidhogg) -> Illberd -> Shinryu I -> Zenos (Shinryu II) -> Destruction of the eyes. I mean I -hope- we are done with him but how weird would it be that we aren't actually done? Maybe Shadowhunter can get retribution in the end?