kakashi lacks the sharingan, he won't speed blitz here not to mention the fact that he overpower gai in cqc since his reaction has greatly decreased. there is a river under the bridge asuma and kurenai fought the akatsuki duo kisame can move the fight there or overflow the bridge. kisame has clones too and can stop kakashi attacks with daikodan. kisame body can absorb chakra too.
Lacking the sharingan doesn't mean that his food speed slows down, he is at the same speed as before and can do the same tai jutsu moves, because his body allowed it and does it still. He can't predict the moves of the opponent anymore, but in exchange he has more chakra and stamina cause the sharingan is no more draining him.
non war arc base kakashi
one eyed catched a chidori with one hand like 3T itachi did with part 1 sasuke.
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kept up with base sasuke in taijutsu
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Kakashi also can stay near the parts which are free of water, he knows that deep water gives kisame the advantage.
He can attack on mid range with lightning dog before kisame is able to preform any large scale suiton and in worst case kakashi can go underground to dodge the suitons of kisame.
I doubt kisames skin is like preta path which can easily absorb any jutsu, lightning dog definitive would leave a mark and paralyzes kisame for a short time.