It crazy to me people saiding Sasuke can't hang with the 4 Hokage in the room, when he is just as powerful(not as knowledgable, because he is only 16 year old), skill, talented as Madara when he fought the first Hokage and no more than second smartest in battle ninja in Narutoverse that alive now. So keep sleeping on Sasuke Naruto Balls Boys, because all he been doing since Danzo fight, is getting his Knowlege of jutsu(Izangi & Izanmi) and of the pass great ninja up, because he can do what he did with Kakashi chidor and create way more powerful jutsu and surpass all the great's as the main villian, your saw what the first said " fight Madara will be pointless if Sasuke in up turning to the darkside"(the first can feel the young boy Sasuke power and know he not that far from being more powerful than Madara was when he fought him).
Wait and let see what Madara think of Sasuke and he fight again, before we make our judgment on how powerful he is with EMS, because in some comer Sasuke is the chosen one. Why your think Sasuke was part of every evil top dog villian plan, Tobi Obito who been doing everything for Madara, need Sasuke for some reason and it not for taking over his body and Orochmaru & Kabuto wanted to take over his body for some reason that would make them all powerful(what is their end game), but all we know is that Sasuke is the key to jutsu not any other clan or anyone else.