I think it's a good idea that he might be a different type of Scadrian pseudo-returned but a lot of people don't understand what happened between him and Harmony in BoM. Harmony didn't do anything to heal/repair Wax, zero, zilch, nil. Marasai was the one who revived Wax, not Harmony, he must've been like extremely near death, maybe just before brain death. Wax says it himself, there's a rumour you come to all those who die (very paraphrased). How could those rumours come to fruition unless there had been other really near death circumstances? Harmony might've put that into the words of founding as well though so who knows.