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I believe that the fruit is the
rebirth mechanism of the Shinju, every thousand years the Divine Tree bares a fruit, and through the fruit it rebirths itself into a new Shinju (so the previous fruits became the new Shinju), Kaguya on the other hand,
interrupted that natural cycle and consumed the fruit before the Shinju was able to completely rebirth itself, that is why the Juubi that Hagoromo and his brother fought was an
incomplete/nerfed Juubi because Kaguya took most of its power, now in chapter 57x, Kurama said that Hagoromo always said that Ten Tail's full revival will signify the end of the world, and now Hagoromo himself said the birth of a new fruit would mean the end of the world, I think that the Prime Juubi (with Bijuus Chakra + Fruit's Power) will be reborn through the fruit/lotus and it will try to destroy all life because Kaguya (and humanity as a whole) transgressed the natural law by stealing its Chakra.
Speaking with a Buddhist friend this is what he said:
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Madara is right, humanity is cursed because of the stolen power of Chakra, Hagoromo is substantially no different from his mother Kaguya, it is only the degree in which they differ, Kaguya is tyrannical while Hagoromo is pragmatic, but both of them are trekking the
Outer Path of Enlightenment, which is a
Buddhist Heresy (relying on an external power/source to achieve enlightenment) there is "Karma" associated with the stolen power of Chakra, whether for benevolent or malevolent intentions, the mere fact that it is stolen curses humanity in a cycle of suffering, Hagoromo tried to alleviate the
Karmic Action of his mother but he ended up multiplying that karma a hundredfold by sharing it with everyone, so unless all Chakra is returned to its owner, the karma of Kaguya's original sin will forever loom in the world.
Giving back Chakra will not result to instant peace, after all, even without Chakra man will still fight wars, and that is why they need a guide, someone to preach to them the new gospel, the gospel of the
Inner Path (the true path of enlightenment in Buddhism, relying on one's own power to achieve peace) Naruto will guide humanity towards that path, and that is why Kishimoto is so adamant in making Sasuke Hokage and not Naruto, for in the dawn of the new world, Naruto must travel it to preach the Inner Path gospel, leaving Konoha in Sasuke's hands.
