Naruto manga 559 released [Anime]

Naruto manga 559 have been released.
In this episode Kabuto have summoned Uchiha Madara with Reincarnation Ninjutsu.

Madara is talking that if Nagato have summoned him with special technique.

Does this mean Uchiha Madara was killed by Nagato?

Who is the other guy behind mask? Tobi?

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