The fight regarding the 4th Kazekage and Kisame would end fairly quickly. Much like his battle with Gaara.
Countering kisame's jutsu
-Gold is 20x heavier than water,which immediately gives the kazekage a huge advantage over kisame. Also the kazekage needs no prep time to fire a gold tsunami,and such can counter a water wave kisame spits from his mouth instantly
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,and when gold and water clash,gold wins.thus the gold wave will push back kisame's water wave,and kisame will be hit with both attacks.
You're most likely right in saying that if the gold dust and water were to clash, the gold dust will win. However Kisame can easily avoid the massive wave that is being sent back at him by using the
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which had enough driving force to completely destroy a considerable sized boulder [
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]-[
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] This technique coupled by a few Mizu Bunshins to join him in the underground assault, will surely spell out death for the 4th Kazege; who will not see them coming, adding on to the fact that he has shown to lack the reaction speed to deal with such an assault from underneath his feet [
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]-[
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] As he fell for the same tactic twice.
Multiple Samehada slashes from Kisame and Mizu Bunshin's ends the fight here. As Samehada was noted to be able to tear off limbs [
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]-[
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]