Board Thread:Naruto Discussions/@comment-26135923-20150707130017/@comment-26275777-20150711230647

History goes back way further than that. The fact that we don't know about it doesn't mean it doesn't exist. (And the Battle of the End was way more recent than that. The village is only sixty or so years old).

And there is still no proof, in the manga or otherwise, that transmigrants can pass transmigrant chakra to their children. I've said it before: like the bijuu (another source of pure chakra) it is not theirs to give, especially Hagoromo's chakra. There is no chakra puzzle to be completed because the chakra remains in them until they die and then moves on to whoever has the good fortune to be conceived at that time. If Yang Kurama was sealed in Naruto and Yin Kurama was sealed in Hinata, their children would not "complete the chakra puzzle" and become a Kurama jinchuuriki. It's the same thing here.