Una bella ipotesi, anche se purtroppo non abbiamo molti dettagli in merito - perlomeno nella saga principale - per poter arrivare a conclusioni certe.
Come ho detto da altre parti, il macchinario che attiva Icarium al termine del settimo volume (anticipazione nono volume)
pur rotto, ha la capacità di risucchiare anime. Nel caso di Icarium rimangono incollate e vanno a mascherare la sua reale personalità; ma in sé per sé pure quel macchinario riesce a portarsi dietro delle anime.
. Quindi boh, non c'è una reale risoluzione in tal senso.
Nel "re-read of the fallen", nella risposta di Bill, troviamo questo compendio:
-The Dying God is a part of Bellurdan that was cast off by Tattersail/Nightchill/Silverfox.
-I say “a part” because back in Memories of Ice Silverfox herself says she has Bellurdan in her.
-The cast-off part ended up on the floor of the Abyss.
-There he met our old friend Hairlock, where he got the idea for puppets.
-He also ate a bunch of other gods or parts of gods, gaining their power.
-He desires vengeance on (I assume) Silverfox.
-He hitched a ride out of the Abyss on a broken machine.
-The worshippers have been constructing him a body in the temple, but Clip will suit him better.
-He plans on riding the river of blood from all the killing the Andii are doing of his worshippers to rejuvenate himself (and maybe to the Redeemer to eat him as well?)
-He recognizes Aranatha, who summons him by his true name, though there is some question as to whether or not she actually got him.