Can we all agre that kakashi has better chances of beating...

[thegame]

I think that either Sasuke deactivated it, or it was just a Kishi's way of saying "Sasuke's going blind" - he might have had the Sharingan active, just not visible due to his eye changes that occured when he went half-blind.

The hint of the fact that it's indeed chakra that limits Kakashi's usage of Kamui is right here:

Spoiler

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Kakashi obviously refers to Kamui when he says "considering my remaining chakra I can only use it a few more times".

Hmm you may be right. When I think about it, it might also be that Sasuke didn't have chakra to activate / use any sharingan ability, but he had enough for chidori.

I just don't think Kakashi went out of chakra in the past situations, where he overused Kamui, since he didn't do much else than that. At least using my kind of logic, it wouldn't make Kakashis power-up so insane, and that is probably what I want to hear xd

For instance, we see Kakashi stumble here:

Spoiler

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a short while after using kamui, it already has side effects. One can only assume that if he uses it in larger quantity with shorter space, it would make him unable to walk / incapable of using kamui. As we clearly saw when he fought Deidara. Kakashi wasn't down through exhaustion, he could still talk and think clearly, and didn't look very exhausted, well you sort of need to go back and read most of the chapter to see it. Even though they waited long in Suna, Kakashi still couldn't walk afterwards. So there must be more to it, than just normal chakra consumption.

 

[kotoamatsukami]

When he entered the battle against Obito and bijuus, Kakashi had already used up some chakra in the battle against swordsmen.
Then he used a kage bunshin, which means his remaining chakra was divided into two.
In other words, he performed 5 kamuis while having less than half of his chakra. If he hadn't used any other techniques besides kamui and kage bunshin, we could surely state he could do 10 kamuis. Because of the fact that he had used a whole bunch of other techniques though (bunch of raikiris and a doton wall) it's clear that he can do MORE than 10 kamuis on full chakra.

Also, the argument "he can do so many because he tries to protect Naruto" is rather poor. If he can do it, it means he has chakra to do it, which means he can do it in any situation.

He most likely gained his chakara back befor fighting orbito..just becuz he uses other jutsu does not mean he could have used kamui more times as you kno kamui takes more chakara than a shadow clone or a chidori..an no will power allows to fight even when they have nothing left.