Uchiha itachi.....he was different...he had control on his emotions......he knew what was right...he knew what he had to do and why? Each and every step he took so far was well analysed by him, he could also predict what might have happened in future and could plan accordingly.....there are a lot of things which make him different and unique...even kabuto said that no1 could have been a better choice other than him for edo tensei......