Once again the only reason that Sasuke beat Oro was because Oro tried to steal his body. Otherwise it would have ended with Sasuke's death. Because Sasuke then didn't have anything to kill Oro with and neither does Kakashi, plus did sasuke beat him? NO, Itachi saved Sasuke yet again by pulling out Oro. Oro actually had access to take over Sasuke's body right then, so tell me who won? Sasuke? Or Itachi?
Oro hasn't actually tried to kill anyone really so far in the series. Maybe Tsunade and Jiraiya but he didn't have the use of his arms then. But I want everyone to go back and read where he attacked the leaf, he didn't just want to kill Hiruzen, he wanted him to suffer mental anguish. Go back to that fight and you will see there are literally 100 places where Oro could have killed Hiruzen. He just wanted to mess with him. Hiruzen was goddamn lucky that Oro was being stupid and playing around.