A jounin was able to beat him with nothing but taijutsu. Tsunade is a Kage who uses taijutsu + she cannot die in a battle. Of course she can take him down.
Honestly? I'm sorry, but your logic is trash.
Kisame doesn't really have durability feats. He got blasted by a Lariat just the same as Sasuke. The damage and impact was near the same.
Meanwhile, Jiraiya's taijutsu blinded and blitzed a Pain Path, who are way above Kisame in taijutsu.
No durability feats? First of all, Sasuke got hit by a V1 Bee and look at the damage dealt to Sasuke
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He's completely knocked out.
Kisame on the other hand tanked a skull V2 Bee lariat
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and unlike Sasuke he was
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While dodging Bee's raiton infused pencil, Kisame says "
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"
Even I, implies he's durable, and he knows it.
And don't make me pull up the scans where he tanked Gai's hirudora and was still able to move immediately after and also breaking out of Yamatos mokuton by shere strength without receiving any type of aid prior to that.
As far as your comment goes about Pain being far above Kisame in taijutsu...don't be so sure. Kisame has a 4.5 in taijutsu according to the databook, meanwhile base Naruto (3.5 in taijutsu) was able to briefly scrimmage with Deva Path when his sage mode ran out.
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Again, killing Kisame with taijutsu of anything short of Gai's caliber is ridiculous.