Nice thread and all, but one thing you must realise is that Kishi always like hyperboles in this manga. One day he says one thing and tomorrow you see the counter. Like he said Gaara's sand was the ultimate defense, yet Lee countered it. Like he said Susanoo was the ultimate defense, yet we saw that underground was the weakness. Like he says in his databook that Amaterasu burns at the same temperatur as sun, but we all know that it's impossible, or everyone around it would have been desintegrated in an instant.
If we go by that logic, must i say that Raikiri can pierce thru Yata mirror then? After all Raikiri's databook says it pierces thru everything:
Even Gai said it in the manga
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If we go by the databook3, when Kakashi wasn't able to use his kamui perfectly, Kamui is the ultimate technique and against this technique no defense is possible(yata mirror included?)
On the second bold part, you even see him saying that there is no technique that can compete against this one. And it's validated when Kakashi said Kamui is unstoppable:
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If it is true,
does it mean that Kakashi is invincible right now?