I really don't see how the DE team will win.
Sidious lost in a lightsaber duel against Luke but Luke also cut of his arm once before he was dying. Neither one of them seem good with a lightsaber. Malak however was good with a lightsaber he was a lightsaber prodigy that has fought in two wars on the front line, both of which were against powerful enemy's, Mandelorians or Jedi. And those people were good fighters. He lead thousands of Sith after that, defeated the greatest Jedi fighter of that era in a fight, and we don't know how the fight happened we still know Malak > Kavar because of other things.
Revan is that + more and i'm to tired to describe it all right now, but he's a lot better with a lightsaber so he would stand up against DE Sidious possibly take him but if he doesn't then he will soon get Malak his help and Sidious will die.