It wasn't a question, but a whole post to counter your arguments.
While you bring compelling points, I can't Kakashi winning against either one of them. kakashi has three major disadvantages:
- Low Stamina.
- Low Chakra reserves, and
- He will never be able to fully harness the power of Sharingen. It's beyond his ability by default.
Kamui is not the answer to everything.
1: During his encounter with Sasuke, he was barely able to avoid the arrow with Kamui:
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And the over-usage kills him. It also doesn't help his case that Sasuke can spam arrows even more so than Iatchi given that EMS poses no stress on the body for creating sussano and using amatersu:
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- Painful erection of sussano. Sasuke mentions that his whole being was in pain. In EMS form, he erects a level four Sussano without any pain at all:
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and uses Amatersu with ease.
It means that he can utilize all abilities of MS without any stress factor and much less chakra consumption. Kakashi on the other hand would be able to use Kamiu 3, maybe four times tops as during pein fight the second time killed him. While he has improved since then, I can't see him over-using this ability as he will still end up using more Chakra as he's not an Uchiha.
2: While Itachi has lower stamina than kakashi, his Chakra reserves are obviously higher, as it is a know fact that the uchiha clan have a very high Chakra reserve:
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Which means both Itachi and Sasuke can over-use their blood-line abilities with ease and with better chara consumption due to the DNA factor and having natural, higher chakra reserves. Sasuke also has a much much better stamina than Kakashi and he seems more resilient as well.
3: He cannot Kamui a level four sussano with Sasuke or even the one Itachi uses because it is too big. Gazo head by comparison is much much smaller, and not to mention he wanted to take out its neck first.
4: Then we have amatersu. It's instant and goes where ever the eye goes. It burns through Chakra as well. I can't see how Kakashi will dodge this when Raikage had to resort to body flicker rather than raw speed to dodge and barely managed by only a few centimeter.
Naruto 463 - Read Naruto 463 Online - Page 12
Naruto 463 - Read Naruto 463 Online - Page 13
Kakashi is just not fast enough to dodge this.
Then comes the intelligence factor as well. All three people are extremely intelligent. So there is no edge to anyone's analytical abilities here. It all boils down to how they use their stamina, chakra, abilities etc. I am sorry, but EMS Sasuke just...destroys Kakashi, and Itachi does it with ease as well.