Ok if u notice Itachi says he didnt trust Sasukes power and he might have been able to change Father and Mother.. I think Sasuke might need Orochimaru to revive his parents so he can find out the truth about their clan and their village. I mean wasnt Sasukes dad the Leader of the Uchiha at that time, Or atleast the police force so he would have been leading them into a Cou so maybe he wants to know why??? IDK but what do you guys think?