I'm not sure if Sasuke has a genuine EMS. I mean Itachi transferred his techniques to him at the end of their death battle. Tobi himself said that Itachi had them put a trigger in Amaterasu the moment Sasuke saw Tobi. Plus his eyes always bleed when he uses them. If they were his own that shouldn't happen right? I mean even Kakashi has a MS that he obtained himself and he doesn't bleed through the eyes when he uses it.