Ah, that was a great chapter, it really made that wait worth it.
Hmmm, concerning speculation... here's some random thoughts: well I'm going to assume Madara has some odd method of staying alive. I wouldn't be surprised if it ends up being similar to Orochimaru's method, but only targeting people with Sharigan(also to prevent blindness). Perhaps that's why, if Tobi is Obito after all, he seems to be the same person. This could be the reason for Itachi to try to spare Sasuke. However, I could be totally off. I wouldn't be surprise if the final stage of the sharigan can manipulate reality itself. That's something I'm getting from Itachi's speech. Madara just wills himself to be alive and it is so. Tobi has been shown to use an incredible power where nothing seems to hurt him(or touch him even). Is this because he's always in illusion? Perhaps he can make things into illusion before they even touch his body? Maybe he's even a ghost or some kind, not completely connected to this world... maybe that's how Madara is still around and why he needs Sasuke, to become corporal.
I wonder if Pain's motives are the same as Madara or one of them are using another.
EDIT: I think there is a chance a member of Sasuke's group Suigetsu(the one with white hair) could be Sai's brother.
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