Yet Itachi and Sasuke put each other in genjutsu,Naruto 689 while Kakashi was hit with Itachi’s genjutsu twice (once as a clone against a clone of Itachi with 30% of his chakra), so that’s out the window. Itachi most likely meant that genjutsu is useless because the Sharingan user can break out of it. Izanami seems to be visually based, but in a different way.How can you not cast genjutsu against at sharingan used?, itachi played with sasuke with genjutsu, the entire time while sasuke couldn’t see through itachi’s illusions that was why itachi asked sAsuke how far your eyes. Can see?, but sasuke never knew saw itachi’s fake illusions..
Madara did it to obito, itachi did it to many uchiha’s member as well as madara and other uchiha’s , this is why they started to used izanagi..
In Another matter, I thought kaguya was going to showed the true power of the first byakugan user but so far I don’t see shit besides she is spamming space time dimension and acid Bones to destroyed the enemy, I bet if she got the sharingan and rinnegan, she could had done better than having. Her byakugan..I’m giving Obito credit because we see him exiting the pure world, his chakra enter Kakashi’s body, Kakashi being handed the double mangekyo and the next second use Susanoo (perfect form) to save Sakura. I’m not giving Obito any credit for anything that kakashi might do in the future with the technique. But from what we have seen the activation of Susanoo is Obito’s credit.So with him getting the gist of it, it would equate to mastery without even having to use it? Versus someone who had both eyes and actually used in conjunction with each other. But Kakashi mentally taking notes in his brain is the equivalent of mastery? Come on now. That’s not even counting the fact that there is no visual way to tell how someone activates it. We know that one has to have both eyes and use the chakra within themselves to manifest it. That’s also not counting the fact that there would be no reason for Kakashi to take mental notes in the first place. He had no idea he was getting those eyes back, especially after they disintegrated in front of him. That’s like people saying that Minato had 16 years to train with the Fox, when he was merely a soul floating in the death gods stomach and had absolutely no knowledge of the fact that he would be released one day. And here we go with that reaching for unknowns thing. For all we know Sasuke could’ve taken a crap in the desert.