How?

[Shichi]

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So did he know all along that it was Obito? Or did I miss a chapter where he was told?

 

[miromiro]

Because he's ****** Orochimaru. Obviously he knew it. Most probably got informed about it when he joined Akatsuki.

 

[SanjiNL]

Orochimaru is ze boss of knowledge. He knows everything.

 

[straightup]

well obito is just chillin there with no mask on and oro obviously sees the real madara right next to him. so I think he just drew his own conclusions

 

[kunde]

Someone must have told him while they were coming to the battlefield. .

 

[Stark]

He knows all, he knew Obito's identity before it was revealed. How do you think Kabuto knew and then found the real Madara.

 

[Klad]

I have a theory that Orochimaru knew always the identity of Tobi.

 

[Revyy]

One does not simply question how Lord Orochimaru knows these things.

We just accept It and move on.

 

[Thundergod123]

Orochimaru is ze boss of knowledge. He knows everything.

He can be the next villain, he is the boss.

 

[Bijuu Bomber]

Hipster Orochimaru

Knew about it before it was cannon...

 

[Aominecchi]

Oro knew
That is how Kabuto knew that Obito wasn't the real Madara......Oro told him

 

[ShishaMastah420]

Orochimaru once molested ever kid in Konoha, they still don't know.

 

[LitAquarius]

Common Knowledge, as the others have stated here. Oro knew since Kabuto Knew.

 

[SanjiNL]

He can be the next villain, he is the boss.

If you think about it, Orochimaru can solo anyone. He's the most knowledgeable guy around, which means his Talk no Jutsu should be a one-hit KO.

 

[Silent Phantom]

well obito is just chillin there with no mask on and oro obviously sees the real madara right next to him. so I think he just drew his own conclusions

There we go.

 

[Sir Blades]

Orochimaru knows everything he is the Aizen of bleach.

 

[chopstickchakra]

You missed the chapter where he told Sasuke he has no interest in this war, he learned everything through Kabuto when he took back his chakra he gained Kabuto's knowledge of events and Kabuto knew who Tobi was because he summoned Madara which suggests Kabuto knew the truth.