What was reveal, if you didn't figure out already every thing Madara said before now, than you are just slow. We already knew that white Zetsu was from the first Hokage cells, so the black Zetsu had to be from Madara right(only new information that came out of that and this chapter was Black Zetsu left Madara will on this planet and stopping Madara soul from fully going to the next world and that how Nagato was surpose to bring him back by using Black Zetsu(which put into question, what was they waiting for, did Nagato just learn how to do the technique, before he save the leaf village for Naruto or was they waiting until they had every tail beast and Why when real Madara can help get them). We already knew that Tobi couldn't have gave Nagato his eye's when he is the same age or younger than him and after Madara already said at the start of this flashback that he gave his eye's away(so who do your numb skull think Madara gave them to) and the real Madara thought when he was first Edo that he was brought back by Nagato(so that mean he knew him, even with it being said he die almost a 100 years ago). Only thing new came out of that is now we all know that Madara had this plan way before he met Obito, so what that mean is Obito is just a pawn, waiting to be play by the real Madara.
This is just like when it was taking these same brain dead people so long to atleast figure out that Kakashi had the other eye of Tobi(forget him being Obito). First Tobi told Kakashi that his Kamui wouldn't work on him after Sasuke and Naruto last talk, than Kakashi was able to transport items to Tobi other dimension(and people just said that Tobi was more advance than Kakashi), than Kishi show their eye side by side with the same MS design and you still had alot of people who couldn't put it together and these are the same people who just realize every plot ending thing Madara reveal.