Itachi undid death itself, and then undressed DSM Kabuto who was like a god tier at the time. Itachi made Orochimaru look like a genin, Orochimaru who was the strongest sannin. Even his only loss was because Itachi himself willed it. Let's be honest Itachi wank was quite warranted since the biggest Itachi wanker was Kishi himself, eveyrthing the dude touched turned to gold.