Board Thread:Versus Debates/@comment-31171723-20170128170340/@comment-734582-20170210111959

Ninja Of War wrote: ^It's overrated, Itachi supporters get carried away... Probably. We've seen comparable weapons used with significant limitations. The most powerful sealing tools (the five sage tools) all required immense levels of chakra, to the point where a few uses drained high-level jonin and pseudo-jinchuriki were needed to use them for actual combat.

Another legendary tool, the Kusanagi, was pretty powerful but couldn't cut through stuff like Naruto's chakra cloak.

The fact that Itachi doesn't use them at every move, even as an Edo Tensei, suggests to me that there are unknown but very powerful drawbacks.

By the way, the same goes for Itachi's eyes. In life, he's limited to maybe two techniques per eye and he's already largely spent. As an Edo Tensei, he doesn't start using his techniques as if they're EMS now. Edotachi is still bound by his limitations. they're not as bad, but he's still bound.

Besides, when Black Zetsu said he was invincible, the strongest living person was probably Jiraiya. Orochimaru had no arms, and the other two (Obito, Nagato) were on zetsu's side. Madara, hashirama etc were dead and there was no indication they'd get revived. Invincible means nobody can defeat you, and well dead people can't fight.