Change of strategy I see.. hmmm
Mengetsu scroll has the ability to seal any of the 7 swords per cannon unless they are being in use (Samahada was being used by bee, and Twin sword by Chojuro). But the wrap itself around kisame strategy is legit! (Kudos) And you are right about them having knowledge on each other, but it works both ways. He can freeze the particles in air and create thick
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, of ice harder than Solid rock as per databook. Kisame still has to preform a doton seal to retreat underground... They have super hearing so no sneak attavk would ever happen. Plus les say he skeaks under ground; They an easily follow since the tech makes the solid around him liquid/fluid. So The needle sword can floow him the moment he submerges (not even fully) and then hook him and make sure he doesn't escape for more assaults.
Kisame has been injured by standered weapons his skin isnt that durable. Let alone to piercing objects when its cannon he can be pierced. Haku's senbons can hit the soft tissue and pressure points similar to what he did to zabuza. Senbons can aim for his eyes etc. Normally it wouldn't be possible 1 v 1 but with so much going on it's easier to employ. If he worries about one thing 5 others will succeed.
And yes, with the mist taking with vission and the attack being soundless he will never see the needle sword coming! EVER! With bee he seen it last second, this is an entire different scenerio with multiple elite joinins attack at once with perfect synergy!