Kakashi blitzes Zabuza in half with Raikiri, canonically (
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)(
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)(
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). Even with MS restricted he and Hebi Sasuke should be able to defeat Kisame, Kisame was blitzed by V2 Bee and Kakashi is even faster as he could counterblitz V2 Bijuu and land Raikiri on them keeping pace with Gated Gai (
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). They have also the smartness and the versatility to make a plan to go around Samehada, they could also electrocute Kisame if he tries to drown the battlefield.