I don't really get why Kishi insists on slapping on adding all of these new information towards the end of the series. So a thousand years ago there were humans that didn't have chakra but because Rikudou Sennin's mom ate the true from the Juubi tree everyone on the planet now has chakra? But Rikudou Sennin went around teaching people how to use their chakra which later became known as ninjutsu. So...what the fuck?!
“Pirates are evil? The Marines are righteous? These terms have always changed throughout the course of history! Kids who have never seen peace and kids who have never seen war have different values! Those who stand at the top determine what's wrong and what's right! This very place is neutral ground! Justice will prevail, you say? But of course it will! Whoever wins this war becomes justice!”
― Donquixote Doflamingo