When Uchiha Itachi wiped out his clan he let his younger brother know that the ultimate nature of their clans bloodline power was the Mangekyō eye.
Itachi told Sasuke that only three people had handled the Mangekyō: Uchiha Itachi, Uchiha Shisui and some unknown third individual.
Now the third must be Madara Uchiha.Also he cant mistake Tobi with Madara as Madara got Eternal Mangekyō Sharingan.
Also he wasnt in the the top 3 guys 2 activate Mangekyō Sharingan.
Madara, Izuna, Obito+Kakashi and Shisui had handled/activated MS before him(except kakashi).
So does he knew that Tobi had Mangekyō Sharingan?
Itachi told Sasuke that only three people had handled the Mangekyō: Uchiha Itachi, Uchiha Shisui and some unknown third individual.
Now the third must be Madara Uchiha.Also he cant mistake Tobi with Madara as Madara got Eternal Mangekyō Sharingan.
Also he wasnt in the the top 3 guys 2 activate Mangekyō Sharingan.
Madara, Izuna, Obito+Kakashi and Shisui had handled/activated MS before him(except kakashi).
So does he knew that Tobi had Mangekyō Sharingan?