Re: My Theory on the truth of Madara. (Spoilers!!)
I think the thing to take away from this chapter is that we have no idea who Tobi is.
Heck, he may still be Madara. Somehow, both Madara and Tobi knew Nagato: Madara commented on him, and Tobi said he gave Nagato the Rinnengan. Since Nagato had a normal life (in the sense that he was born at some point and died at some point) we now know that Madara and Tobi had to have been alive at the same point.
Unless of course Madara can somehow time travel.... It is called space-time Jutsu, after all.
I have always thought a crazy twist would be if Tobi was actually a future, evil Sasuke, but hey, who knows.