Guys...this is what happened...

Itachi put a seal on Sasuke that triggers an Amaterasu whenever Madara shows his face. Therefore, Madara has to keep his mask on in front of Sasuke.

Sasuke's MS was enabled by killing his brother. So far, I'm going to assume that everyone with MS has access to the same (or at least most of the same) techniques, which is why Sasuke has Amaterasu and Susano. Sasuke also has Kakashi's space displacement jutsu, as seen when he used it to remove the Amaterasu he unleashed on Killerbee.

If this is true, then Sasuke should have Tsukuyomi. Which would beg the question, why the hell hasn't he defeated everyone in the room already?