Guiltythree
the sin of solace is tied to the tomb of ArielSo he may have the capabilities to be the same wichever version of Sunny it IS or wichever timeline it is (Aka mad prince Aka the one who wrote be careful what you wish for, Aka the one who sent a Dream to aneke with nightmare maybe Aka the one who left the boat of noctis there, Aka the one who gave him the supreme memory and more to Come)i think Sunny maybe stuck in an endless Time loop where each Time he try to save the past him with whatever he Can and each Time he fails he can add something more to help the past him (maybe he wish for it each Time for exemple)I think that ironically, Sin of solace maybe the only think that Can help him regain his sanity temporarily when he become the mad prince and so he can do something to save everyone and break fate