Kuroinu Rebellion: Vult's Final Outcome (Patreon)

So I'm sitting at abit of a cross roads and want to know which is more satisfying for the Players for both the game and the setting on vults Eventual outcome to the Final Boss fight.

Originally I wrote that Vult Dies when you defeat him at Geofu but Kuro takes his Corpse and uses it as his new body even though its dead and decaying, Kuro then retreats to the Black Fortress where you fight him inside Vults body and eventually Assumes its True Demonic Form after a prior boss fight.However the more I thought on it the more it seems like Vult was to much of a pathetic waste of space and made it too much focused on Kuro, So The Alternative Idea swelled in my head, that when Vult Relents and Willingly offers up his Body to fully become Kuros Avatar however Vult pulls a fast one on Kuro and manages to Slorp up all his Power Supplanting the Old Black God with himself, given that Vults Ego is so astronomically massive. Things then proceed as normal but when you kill Vult at the end of Phase 2 Kuro manifests himself by Devouring his soul to give him enough Strength for 1 last Fight (Or Possession if the PC's Corruption is too high), Basically making Vult much much more of the BBEG then some eldritch nebulous being.

What do you all think? Like the Original the Alternative or Do you have your own Version?