Well this would be an interesting fight. Hiding in the Mist + Silent Killing Jutsu + Crystal Ice Mirrors = a Jutsu combination that would be hard to simply stay alive. Headhunters Sword is a rediculous weapon made for decapitating but I'm wondering if since Kimimaro controls bones, can he just regrow said limb? Even if he can't, I'm willing to bet he is strong enough to break the mirrors like nine tail chakra cloak naruto did. Even Gaara couldn't kill Kimimaro when he dragged him some rediculous distance under the ground and packed the dirt over him. Kimimaro State 2 is even more rediculous, able to harden his bone pike to densities harder than steel and use all of his clans dance techs including valley of bones, which rose a good 20 feet out of the ground and stretched for a half mile or so.