How did Madara know that Sasuke is the last surviving Uchiha?


**SPOILER ALERT: If you haven't read Chapter 657 of the manga, read further at
your own risk.**

In Chapter 657, the reborn Uchiha Madara asks Sasuke to join his side,
remarking that they are the last of the Uchiha. However, he died before the
Uchiha clan massacre, and was reincarnated with Edo Tensei only during the
fourth World War. He fought with the five Kages, and then headed to the
battlefield where Obito was fighting Naruto's team. Obito didn't have a chance
to tell him the story of what happened after his death.

How come he knows that Sasuke is the last surviving Uchiha?

![Madara asking Sasuke](https://i.stack.imgur.com/ikAYhm.png)




In pages 11, 12 and 13 of chapter 657, it is clear that Madara and Black Zetsu
(Madara's will) are able to communicate with each other:

[![Page 11 of chapter
657](https://i.stack.imgur.com/RzIR1m.png)](https://i.stack.imgur.com/RzIR1.png)

Black Zetsu adds (in page 11) that both him and Madara were underestimated.
And in the two pages that follow, he 'shows us' flashbacks in which him and
Madara have been communicating during the war.

Given this, **I'd say it's safe to assume that Madara got the information from
Black Zetsu** :  
Either because he told him everything directly; or Madara may have gotten the
information 'instantly' as soon as he was revived, since Madara and Black
Zetsu share a deeper bond, since the latter is the former's will.




In pages 11, 12 and 13 of chapter 657, it is clear that Madara and Black Zetsu
(Madara's will) are able to communicate with each other:

[![Page 11 of chapter
657](https://i.stack.imgur.com/RzIR1m.png)](https://i.stack.imgur.com/RzIR1.png)

Black Zetsu adds (in page 11) that both him and Madara were underestimated.
And in the two pages that follow, he 'shows us' flashbacks in which him and
Madara have been communicating during the war.

Given this, **I'd say it's safe to assume that Madara got the information from
Black Zetsu** :  
Either because he told him everything directly; or Madara may have gotten the
information 'instantly' as soon as he was revived, since Madara and Black
Zetsu share a deeper bond, since the latter is the former's will.

