Interesting, it seems Obito finally grew a backbone and is standing up against Madara's will, or at least evidenced by the fact that he can keep Black Zetsu from leaving his body. I really liked Madara's explanation about the Sage, and it shows how chakra spread, but the thing I liked most about it is how Naruto did the same thing with the 9-tails' chakra to the Shinobi army. I wonder what Obito is going to do? I mean, as long as he can prevent Black Zetsu from leaving his body, he can stay alive, and it seems that he's trying to take the 10-tails' power away from Madara, but Naruto is still dying over there, and time is running out.