Lets get this straight if that battle went on and someone had to die. At that time kakashi would be the one to go. A 100% kakashi at this point of the manga would have gotten himself killed. People say no he wasnt trying to kill him and i say okay your point is kakashi would have still die if they were to fight and if you want prove here it is.
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Sasuke charged at him and almost instantly his susanoo appeared and fired a arrow. Stated by kakshi himself his only option was to kumai it. Danzo who had time to think about it choose to used izanagi to avoid it because he stated he didnt have enough time. This tells me by normal means its impossible to just avoid or even dodge without paying a price.
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If that wasnt bad enough sasuke susanoo leveled up again but not long after his eye started to bother him sending susanoo away. This would be the chance for kakashi to end it all now everybody says he could have kumai sasuke head. Smart but wouldnt work. Now lets have scenario. First move sakura out because we said fight between sasuke and kakashi.
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Scenario:While getting the kumai ready for sasuke kakashi's body would have gave out on him because running take less out of you than preparing a move your body wont be ready for. So if were doing what people say he should do kumai sasuke head. Then in my opinion kakashi would have wasted the rest of his chakra. Proving when he fought deidara you can feel the area that is caught in kumai.
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Sasuke would escape the second kumai because kakashi would have looked down because of his body and he would have try to move on his own. More than enough space and time(lol space/time jutsu) to get to a save distance away. After that is over kakashi wont have been easy pickings
OR
They would have ran at each other (because another kumai wouldnt work proving above) still woulod stumble because gain his body gave out on him. Sasuke would have just seen this a as a open for a chidori where it would hit who knows but it will even if its a grazed from their sasuke would slowly start picking him off. Who knows sasuke even be ready to use amataresu or even susanoo again and kakashi doesnt have and answer for sasuke if he starts spamming those 2 thing.