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After Kakashi studied Tobi's movements during the Fourth Great Ninja War, he
realized that his ability to teleport and pass through things is all one
single jutsu, he even said it himself. The ability to pass through things is
when Tobi sends a specific part of his body to the Kamui Time-Space. When he
teleports, he takes his entire body with him. Even being said, Kakashi
couldn't even pass through things until his fight with Kaguya Otsutsuki.

Knowing this, shouldn't Kakashi be able to pass through things as well?


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naruto
Why couldn't Kakashi pass through things?


Note that the two eyes of Obito performs two different actions. The right eye
performs the space-time ninjutsu or the teleportation jutsu for the user only
(so it a short range version of kamui). The left eye performs the
teleportation jutsu for the enemy that is targeted i.e. the user looks at the
target and concentrates so that the target is transported to the space-time
dimension (so it is a long range version of Kamui). Kakashi has the left eye,
so he can perform the long version of Kamui while Obito performs the short
version of Kamui.

Even if Kakashi got the right eye, he couldn't be able to perform such a
chakra-inducing jutsu because he is not an Uchiha. Note that Kamui is the
speciality of Obito's Mangekyo Sharingan (which is [Kekkei
Genkai](https://naruto.fandom.com/wiki/Kekkei_Genkai) exclusively for Uchiha
clansmen only). So, using Kamui demands a great deal of chakra for him to
perform. It takes him an extended period of time to gather enough chakra to
use it, and once he does he cannot use it again. Even if he does, it won't be
as effective as he would have wanted. Also, repeated use of Mangekyo
Sharingan's abilities can damages user's vision, eventually reaching the point
where it causes the eyes to bleed. For Kakashi, it would be very, very
painful.


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TLDR: Kakashi's inability to pass through things was mainly as a result of the
bloodline limit restrictions of the Sharingan. This made the Sharingan use up
a lot of his Chakra which limited the daily usage and time duration in which
Kakashi could use the Sharingan. Hence effectively preventing him from
utilizing its true capabilities.

Like Fumikage Tokoyami already mentioned, the Sharingan is a Kekkai Genkai
exclusive to the Uchiha and so compared to Obito who could freely use the
Sharingan, Kakashi's use was fairly restricted. An interesting encounter where
this was mentioned could be seen in Kakashi's battle against Itachi.

[![enter image description
here](https://i.stack.imgur.com/PdT5b.jpg)](https://i.stack.imgur.com/PdT5b.jpg)

This "incompatibility" basically ensures that non-Uchihas are unable to truly
unlock the hidden abilities of the Sharingan and hence acts as an impenetrable
ceiling cap for anyone who isn't Uchiha.

Now back to the question, Obito's "pass through" ability is a pretty advanced
application of the Kamui which seems to require less Chakra as its only shifts
specific sections of his body to the Kamui dimesion. Nevertheless, the
precision, accuracy and timing involved would require a great deal of training
and understanding of Kamui that Kakashi could never attain given his limited
access to the Sharingan.


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