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As for inevitability, hope is an eternal force, there's always hope which means there's always a chance he could come back, in theory anyway. Such as Satoshi is there's no guarantee one way or another if he lives or dies.
the important thing to remember here is that his powers, such as they are are explained and transmutive, honestly at the "true" end he has zero powers or weapons. Well aside from Gao and his crossbow