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Kisame could come close to possibly soloing the 5kage... Reasons why...
Gaara- Kisame is easily the best Suiton user in the series... Suiton>Sand also isn't it possible that Kisame could absorb his chakra out of the sand... Water dome would make any sand attacks useless...
Mei- I don't even have to explain honestly...
Oonoki- Jinton his only offensive tech it seems like... Which Kisame would absorbed easily... Also he wouldn't be able to get close contact via Water dome...
Tsunade- Same as Mei...
Raikage- Is the main problem for Kisame since Raition>Suiton... But i believe water shark bullet should do the trick...
I believe Kisame could defeat the five Kage if he plays smart
Dude, do you read the manga?
Kisame would have never been able to beat 5 kage lmfao.... what are you talking about? Kisame is indeed strong, but how can he counter Raikage's speed, and remember when Ay and Bee used that Lariat combo? Even it was Zetsu's jutsu, however Kisame cannot dodge it. When we go for Mei, then yes I agree Kisame would have crushed her into pieces, but never let your guard down when Tsunade is there because her regenarate abilities allows her to heal herself almost instantly. Gaara can possibly save the others by the help of Onoki's boulder jutsu mix with Gaara's sand to become more worth to fight.
You said that Onoki's Jinton would be absorbed by Kisame's Daikoudan jutsu? Well, in that case his Jinton can easily penetrate the jutsu by ease since the tech has the strength to turn things into molecular lvl, besides Onoki shits Kisame whenever he wants too... Jinton is faster...