cLoneWarriorS
Member
This one makes sense to me.Attention!Spoiler alert
(Don't read below if you don't wanna know)
I'm pretty sure that in the last coffin is the real body of Madara. Since it is mentioned many times that Madara can't be as old as Konoha and still not a bald geezer, he's probably using a soul container like Orochimaru does. A container that somehow doesn't wear off in just 3 years (the sharingan maybe helps) . Therefore, if Kabuto revives it, Madara's soul will go back to it's real body and will be under the control of Kabuto's jutsu. Scary, huh? That' why Madara has to put up with Kabuto for a while.
I look forward to see if it's right.
My guess on who is in the 6th coffin narrows down to two: (1) Madara (2) Sage of the Six Path