Board Thread:Wiki Discussions/@comment-25139119-20140915033602/@comment-28861328-20140917185544

^ Bingo. Its called "Six Paths" because of Hagoromo's moniker. They have no reason to call it Kaguya's chakra or Ten-Tails' chakra, because Hagoromo is the one who made that power famous as the "Sage of the Six Paths". The Ten-Tails wasn't even known about until Obito outed it to the Five Kage and Kaguya was someone only Madara had knowledge of prior to him spilling the beans to Hashirama during the war. Hagoromo's name was lost to history, so the masses simply referred to him as the "Sage of the Six Paths". So, when you don't have a name for someone, what are you going to call traits/abilities/weapons that belonged to them? Why, you're going to use the only name you currently have for them: in this case "Six Paths".