Board Thread:Versus Debates/@comment-26636534-20170822151908/@comment-25122992-20170825153643

No reason to believe that Itachi knew Tobi's true identidy. Unless you can prove he knew. In every instance, Itachi has called him Madara. Heck, even Oonoki briefly decided to believe that Tobi was Madara, despite crossing paths with the actual Madara in the past, up to the moment it was revealed that Tobi wasn't.