This is just going to be a real quick and short theory thread, nothing too special. Speaking of that, let's get right into it.
So, we all know that prior to the War arc, Kakashi was extremely tired out whenever he used Kamui. About 2 times max was pretty much his limit. However, ever since Kakashi, Guy, and Naruto began fighting Tobi, Kakashi was somehow able to spam it without being too tired out. I believe that this factor is connected to Obito himself. Obito can spam Kamui and not go blind due to the senju cells inside of him, and strain doesn't seem to affect him. What I propose is the idea that every Sharingan is connected to its host, including the nature of the eyes themselves. This would mean that Kakashi cannot go blind in his left eye as long as Obito is alive and has Senju DNA inside of him.
Now you may be wondering: "that's great and all, but how come Kakashi isn't getting as tired out anymore?" This is most likely because Kakashi and Obito were, at this point, in a very close proximity to one another. At this point, we know that if two Sharingan are separated, their effectiveness is halved except for when the two Sharingan are close to one another. Since Obito is the Sharingan's host, this means that when Kakashi and Obito are near one another, the effects rubbing off on Kakashi are even greater, allowing him to spam it as long as they're close to one another.
What do you guys think?
So, we all know that prior to the War arc, Kakashi was extremely tired out whenever he used Kamui. About 2 times max was pretty much his limit. However, ever since Kakashi, Guy, and Naruto began fighting Tobi, Kakashi was somehow able to spam it without being too tired out. I believe that this factor is connected to Obito himself. Obito can spam Kamui and not go blind due to the senju cells inside of him, and strain doesn't seem to affect him. What I propose is the idea that every Sharingan is connected to its host, including the nature of the eyes themselves. This would mean that Kakashi cannot go blind in his left eye as long as Obito is alive and has Senju DNA inside of him.
Now you may be wondering: "that's great and all, but how come Kakashi isn't getting as tired out anymore?" This is most likely because Kakashi and Obito were, at this point, in a very close proximity to one another. At this point, we know that if two Sharingan are separated, their effectiveness is halved except for when the two Sharingan are close to one another. Since Obito is the Sharingan's host, this means that when Kakashi and Obito are near one another, the effects rubbing off on Kakashi are even greater, allowing him to spam it as long as they're close to one another.
What do you guys think?