Voidsent souls on the source.

[Rannie]

Uhhh Ardbert wasnt "in" our body before merging with us on the first before the hades fight, remember he almost starts a rejoining with us after Malika's Well before pulling back with a cry of pain. Fake Hytholodaeus in the fake Amuaruot also sees his soul (not the full body apparition) walking NEXT To us instead of our soul being thicker. He wouldnt have been able to see the seperate soul next to us it he had been "riding in us" the whole time.