a strong body is something he could create himself. it's the sharingan which he has no control over that he wants. where does it say that Oro does not want Sasuke to kill Itachi? i'd conjecture he'd want Sasuke to take out Itachi for him because Oro sees Itachi as his only true threat. but conversely, he might not want to Sasuke to try for fear of Itachi killing him and Oro losing his container. but when does Oro say he does not want Sasuke to fight Itachi?