Originally Posted by Narutologist
Let's look at chidori for a second. Kakashi trained sasuke to used that technique in the part of naruto...since then sasuke has taken chidori on levels we have yet to see kakashi accomplish. he has so many variations of it its a shame. Now he has a new sharingan that we have yet to see anyone else have. then look at that technique he did on itachi...that was all him. I can see the argument on character and all but there is no need to have two narutos in the manga...sasuke's character was shaped by the pain he felt as a child...hell the boy till this day remains to be confused because he doesnt know who to hold responsible for the destruction of his clan anymore. I sympathize with him...i think sasuke far exceeded the expectations that kakashi had and definitely orochimaru (he was so shocked when that sword come through the door)...
We'll probably never know all the things Oro helped teach Sasuke. I'm much more inclined to believe he learned those things and the following spin off techniques from Oro. Thats what we're instructed to believe through the story.