If orochimaru was at full strength, im sure he would pwned sasuke, I mean Oro did defeat the 3rd Hokage, and im damn sure sasuke isnt stronger then the 3rd. Well not yet. Orochimaru was in such a weakened state. And it took sasuke to go to C2 to beat him. thats why i think Kabutochimaru can take down sasuke. Kabuto beat the 5th as well.