
Originally Posted by
Yukimura
What I find much more interesting is:
Madara's face had similar whisker like lines on it like Naruto's does. It takes effort to draw three lines on a face which leads me to believe they were put there for a reason. We know the Yin chakra of the Kyubii went to Naruto and the Yang chakra is somewhere else. I may be misremembering and it's the case that only the Yin chakra that is able to mix with Naruto's at the moment and that key unlocks the Yang chakra which is also in him, in which case this next theory is moot though. However, if the Yang chakra is somewhere other than Naruto then I think it's possible Madara could have managed to get his hands on it from wherever the Fourth decided to stuff it and make himself a Jinchuuriki.