Board Thread:Naruto Discussions/@comment-29393962-20161111215453/@comment-25122992-20170111125555

Okay, but they weren't necessary "Yin" and Yang", these two chakra types are just two components which make up Hagoromo's chakra when mixed with each other (the principle of Madara's Rinnegan awakening Hagoromo himself explained). Hagoromo already gave his normal, undivided and pure chakra to Naruto/Sasuke.