Kakashi wins mid diff.
Izanagi
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, danzo
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before susanoo arrow, & kakashi
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w/ just his 3T active. Kakashi can snipe much faster than danzo can think to activate his jutsu. Even if he does, kakashi doesn't need kamui to kill him for the entirety of his izanagi duration. Hell kakashi can simply avoid him until he runs out, if danzo decides to cancel it to try & conserve chakra then kakashi can still snipe him no matter the distance.
[
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] <- Kakashi has at least that many snipes along w/ his original fighting style before he becomes
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.
On another note, what's preventing kakashi from simply warping away danzo's entire body? Wounds & death are the only things that izanagi is seen to erase, if minato for example were to tag him & send him to the other side of the planet izanagi wouldn't bring him back. Going by that logic kamui is merely transporting his body w/o any injuries to his dimension, therefore izanagi shouldn't allow him to escape.