It's actually been a few years since I've seen the series (awful subtitles scare my away from my FX sets), but I think it was Valgo (if not, then it was Gabil) that killed his human host body, at which point he took folded his EVIL body in, and kicked all kinds of ass. Point being, while he did still have a tie to the EVIL body, the bulk of his "essence" was in the human host body until it died. Assumedly, he could have also resolved the situation by doing what Gepelnitch did, in joining both bodies.
Omaega kazeni narunara....