Board Thread:Theories and Speculation/@comment-35172651-20180401134411/@comment-734582-20180405131737

BigVibber wrote: Did sasuke ever explicitly state that obito did or didnt have a sharingan. Sasuke thought obito was madara and it would be natural for sasuke to assume that a legendary uchiha would atleast be in possession of the sharingan Sasuke wasn't making any comments on how it was weird that a nobody like Tobi suddenly had access to a Sharingan, despite Tobi being present during the battle against Deidara. Plus, Sasuke saw Kakashi's sharingan and so too would've recognized a similar chakra.

This was WAY before he revealed himself to be Madara.