But that is a contradiction right there. To justify Yata's repelling of all attacks is the same as justifying the swords ability to break all defenses. It can't be done, and the only case it can would be illogical because you would be disregarding one side (in this instance the swords capabilities to break the shield/mirror) to favor another.
But again, Yata was not only hyped. So there is no contradiction on Yata's whole part.
The sword has no known abilities, it is just said to break all defenses without further explain. The sword's abilities are not defined, it is merely hyped by a Shinobi. The databook however explains, that the mirror has the ability to change all of its attributes to alter its properties in accordance with the incoming attack, thus rendering the attack useless. Because if the shield adapts its attributes on the attack, the attack is logically ineffective. This is no hype, there exists no contradiction and this specific ability. If this sword will be about to his the mirror, the mirror will start to adapt its attributes on this sword to render the attack ineffective. You can imagine it like the sword is mirroring the attack back, not simply defending the user with durability.
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You see how the Yata repels the snake's heads? It mirrors them back in all directions, while the shield itself doesn't even have a solid form.
While Danzo's Kunai broke when he hit Susanoo [
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], Sasuke, once hitting the Yata mirror, was reflected and turned back:
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There is no hype contradicting Yata's databook entry. Even if it was true that the sword can get through any defense, it yet fails to go through the mirror, because the mirror has the specific ability to alter its nature in accordance with the attack. Hence, the attack will always be ineffective, because the Yata mirror adapts its nature on the attack. That, is not hype, that is Yata's ability.
