Re: Now that we know the 6th Coffin is Madara...
I was expecting something like this for the 6th coffin, piecing it together there wouldn't be that many people who would have made Tobi (what we believe to be Madara at the time) shit breaks at seeing an unknown Edo Tensei, well now we definitely know why he reacted in that way.
As for Tobi, I Agree with Sunagura on his 2 Madara theory because ever since we have known about the trump card and in my arguments if it was Madara then who is Tobi? I'm guessing there is some kind of truth to what Tobi is saying.
In the Kage Summit arc he even states he is a shell of his former self, what I always took from that is the condition he is in, yeah he can still fight to some extend but compared to the real Madara who is such a baws he blows the door off his coffin rather than waiting for it, this explanation being using the cells of the Shodai he essentially cloned himself probably intending it to be his "vessel" (much like Orochimaru switching into a new body) but the plan back fired when his vessel rather than becoming a soulless body became a clone of himself. As a last chances to continue his life he basically got stuck with the clone and had to try and reformulate but couldn't and ended up dying which is where we see the clone of Madara (Tobi) continuing on the plans.