- First of all, it was not "one" Susanoo arrow. It was 2. Just take a look here:
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- If he goes underground he will catch Sasuke easily that way, so i don't know why you think he can't. Just forget the fact you don't want Sasuke lose and consider the situation, and you will see it will be pretty easy that way.
- You have also forgotten that if Sasuke look at Kakashi, he will also fall in his genjutsu.
- For Susanoo arrows or Amaterasu too much for him, just don't forget, Kakashi is not the only one who will have side effects of his jutsus, and even if they have side effects, that doesn't mean they can't still continue fighting. The fact Kakashi had a side effect doesn't mean he could not spam Kamui again and again. As i've already said in another topic:
Yeah that's what we should call a side effect of his jutsu like Sasuke also had here:
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(You can see him sweating)
Or here:
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Here too:
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(he seems to have difficulties to breath and stay up)
Like here too:
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(here it seems like his life is even in danger)
I can show you a lot of scenes in that fight where Sasuke was in difficulty but that bring nothing. There were also scenes where he had difficulties to stay up and his mouth was bleeding because he had difficulties to maintain Susanoo for too long and launch his arrows.
But all that doesn't mean that even if they have side effects of their jutsus, they can't still fight. Proof is that after that Kakashi noticed the side effect of the jutsu, he was able to continue fighting with ease(he gave a blow to Sasuke that made him go way to the bridge:
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He also managed to escape quickly to a clone that manage to take him from behind, jumped and catch Naruto with ease:
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).
So even if kamui has a side effect on him, it doesn't mean he can't do that again and again. You are always saying that, if Sasuke throws 3arrows it will be over for Kakashi, but what you have forgotten is that even in the fight against Danzo, he only manage to throw it 3/4 times(forgotten) and even during that, he had side effects of his jutsus.
Kakashi is not the only one who will get tired after that if we consider that the fight would have occured at that time.
I say it because time has past since that. Now it seems Sasuke control Susanoo more easier than before, and Kakashi can fight during 2days against 7swordsmen+haku+2guy with KG+5Jinchurikis along with Guy. So maybe their stamina are far more impressive as they were at that time.