i think it naruto because in the magea it's show that naruto is getting ready to fight sasuke and he is also ready or wants to fight the masked ninija madara because madara is the person that killed narutos dad and mom naruto know that from his dad.....and because he knows/thinks that madara made sasauke even more dark than he was and trick sasuke of every thing he know about is clan death ....i think that why naruto will fight him
i discover something... it seems that he is the legensary ninja of the six paths or warever... i saw a few images with that power... but i dont no if its real