Always had a feeling about Black Zetsu and "Madara's will" ever since he create them. The simple fact that when Obito and Nagato go ape shit and sprout black rods from their bodies when Madara had no piece in either of them. And that he used the Gedo to make his will sustainable, you could also say when he used Gedo as a life support his will slowly was being corrupted. Madara originally wanted what Hashirama wanted.
Now I just want to blame SO6P for making The Tablet and allowing Madara that much knowledge which made him corrupt and ignorant of what The Sage really wanted. Seriously, what was the point of the damn Tablet? Hope that the more they suffer the more they need to trust people around them? Quite a contradiction.
As people said before the chapter was a little on the BS side. Too many dream panels, Madara getting trolled beyond belief (I don't think he's escaping), and Sasuke being an bigger **** than he usually is when the world is about to end.
Quick though: With the tree absorbing all chakra is it safe to assume all of it is essentially going back to BZ and possibly Yamato? Assuming both Zetsu's are now on Kaguya's side? Seeing as the both come from The Jubi?