You bring up interesting points especially about Sasuke's escape that I didn't link together. Yeah my bad, I meant white zetsu part. I do think Kakashi not being an uchiha also has something to do with him not going blind.
Well we don't know if he is not able to use Kamui. He only mentioned the phasing part of Kamui, and didn't try to teleport, while Madara used teleport but never used phasing.
I disagree with both of you regarding Kakashi's situation and I'll explain why.My thoughts exactly. The eye blindness is definitely something related to Uchiha Blood and Special Chakra only. The latter is released only in Uchiha brains. He lacks them. So, his eye may not work at the optimum level but conversely, it's free from the side-effects as well. Whatever the seal is, it may not be explained, but it clearly hinges upon blood and special chakra.
True. It could be a plot induced factor for Naruto to disallow Obito Kamui. But, in defense of my argument, we know that control is pivotal in managing chakra or even entities. As in Sasuke's case for Orochimaru and here for Tailed Beasts. He couldn't handle one Rinnegan which is why he was not a perfect 10 tails host at first. It took him a while to gain control of it.
I believe it was that massive level of concentration to control the Rinnegan and the Tailed beasts that he couldn't spare anything more.
Not only did Kakashi complain about nearly going blind during the war, but he directly implies it when his team and Chiyo face off against Itachi (who at the time was a fodder transformed into Itachi) early in Shipuuden. He directly asks Itachi, "How far have your eyes sunk into darkness?". Kakashi was not aware of the Uchiha tablet and thus could not read it. Also, Itachi was the only one who had that knowledge and, judging by his surprise, we can tell he did not tell Kakashi himself.
Without a doubt, this proves Kakashi had already suffered vision loss as soon as the onset of Shipuuden. Sometime after awakening it, he began noticing the decline in vision and by the time he fought Itachi, he was certain it was a fate shared by all MS users.
You guys arguing he's immune to the effect not being an Uchiha is ridiculous. Kakashi's MS is comparable to Madara's wireless Susanoo. If Susanoo can be used once its unlocked (regardless of eye status) than of course MS descend into darkness, no matter who they are transferred into. Once the eye is created, its got all the necessary Uchiha ingredients to go blind one day. Also arguing Kakashi has a pseudo-EMS (having had the eye transferred) is not logical as EMS directly requires an exchange of MS, meaning the person needed to have his own MS for his new pair of MS to become EMS. This exchange is what creates both the lack of blindness and combined pattern. Considering the only direct evidence of EMS requires this criteria, than we must assume its an actual constraint.
I wanted to also clarify something about Edo Madara. You state that Kabuto altered him, which is true, but you did not mention the fact that Madara was indeed revived old. It wasn't as if he was a special summoning, rather he was revived old and Kabuto modified him to become like his prime. I'm not saying you don't think this, but you didn't directly mention it. Some people think he was revived young somehow, but since he had access to the Rinnegan, that means he could only have been revived old from the onset. Considering he only unlocked Rinnegan as an old man and everything.
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