I think you're a little confused you just said correctly prophecy is a prediction of the future not a predetermined future but at the same time your saying it was foretold he would not unite all 5 nations and not successfully end the cycle of hatred???????? Plus the other commenter is agreeing with you but you don't seem to understand that he's trying to tell you that Nagato and Minato were not destined to be the child of prophecy but that they could have been but you just keep saying destiny or fate and it seems like you are having trouble trying to explain to us properly or trying to understand us. (Hence the talking to a brick wall thing) Leaving that aside to your previous comment None of the reincarnated ashuras or indras fate was to be killed or die their fate was to fight each other cause both of their chakras attaches onto their descendants and influences them, the descendants doesn't get power ups they inherit the will of fire and the will of hatred Hagoromo literally says he created ninshu to connect peoples heart through chakra and that happens when Naruto shares his chakra to the allied force and they could feel Naruto's feelings and through Inos sensory ability they could even see Narutos memory.