Well, IF Kakashi warps him, TECHNICALLY he wouldn't be killing him so Izanagi wouldn't work....
Kakashi wins
Not exactly because izanagi nullifies any disadvantage to the user and technically getting kamuied is a disadvantage so izanagi will nullify kamui.
all that matters is which is faster, kamui or koto amatsukami.
KA because it doesn't require eye contact. Danzo doesn't have to remove his eye patch unlike Kakashi.
OT: Danzo mid difficulty at most even without KA. Kakashi doesn't have katons like Sasuke does so Kakashi will have a hard time against Baku. He could probably make quick work of it with kamui though. Anyway Kakashi doesn't have the stamina to take on an opponent like Danzo because even Sasuke was drained by the end of the battle. Not only that but Kakashi doesn't have susanoo so he won't be able to protect himself from Danzo's arsenal of wind attacks for a duration of 10 full minutes.
Even if Kakashi manages to "kill" Danzo, Danzo will just
You must be registered for see links
right behind him and kill him.