Board Thread:Versus Debates/@comment-44916514-20200123204114/@comment-43403813-20200131132542

@Senjutsu

I don't think it would have been completely useless on Fugaku, since the use of Koto would still deter him from the coup d'etat. Also, Shisui is the original owner of the eye, so he can use Koto dozens of times, rather than waiting years to utilise it.

Madara's clones would indicate it. Clones only share their information and experiences once they poof, so if Koto is cast on a Madara clone or the real Madara, all the other Madaras would see the chakra build-up in Itachi/Crow's eyeball and alert the rest. Once that happens, Koto is out the window, since it can be used only once per decade.

Well, we can only assume that the genjutsu is not permanent. If I cast Koto on you, and then I died, do you think that the genjutsu would persist even after my death? What Itachi says just confirms that Koto doesn't last forever. Even if it could, it would be hard to, since humans are very easily influenced by external forces that your "idea" could be influenced too.

Danzo got caught around the time where he began to cast the technique, which is why Ao saw an active chakra network. Mifune had just started talking about Danzo's idea, which was when Ao checked Danzo. If Ao had waited any longer, he probably wouldn't have seen an active chakra network in Danzo, since the genjutsu would have already been executed, and Danzo would have deactivated Shisui's Sharingan.

Again, it wouldn't make sense if his Sharingan remained active and was continually maintaining the technique, because that would render Koto pretty much useless; the genjutsu would always break when the target leaves the caster. >>> This was proven false given how Itachi travelled to Kabuto's hiding place, still under the influence of Koto, despite burning the bird and Shisui's last remaining eye.