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Kakashi's official take is that the Eight Gates is not an area that can be reached purely through effort.

Therefore, Rock Lee is also a genius.

In other words, while the Eight Gates isn't a lineage issue like a Kekkei Genkai, it's a level of mastery only achievable if you possess innate, natural talent.

Actually, if you think about it, this makes total sense. If the Eight Gates was the kind of thing anyone could unlock with just a little effort whenever they felt like it,

that bastard Danzo would have already established something like an 'Eight Gates Suicide Bomber Unit' within the Anbu.

No, even before that,

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Lord Dirty Schemer (Tobirama), who invented all kinds of jutsu and was proficient in anatomy, would have long ago created something like the [Dirty Release - Technique To Absolutely Screw Over The Uchiha Using Eight Gates].

진작에 [비열-팔문둔갑으로 우치하졷되게만들기술법]같은거 만들었을거임