But you seem to be over looking some factors here, Hebi sasuke was barely able to evade C2 with no knowledge WITH CM the first time. Someone like Kisame hasn't displayed the agility nor feats to counter a close ranged attack with such destructive radius before. Feats suggest he will have trouble dealing with clay bombs.
That attack on Hebi Sasuke wasn't close range since it prompted him to note Deidara was a long range fighter
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C2's attacks shouldn't be a problem when Kisame can take flight with his shark to cover the distance between him and Deidara or to simply avoid them considering its speed
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. Clones can act as diversion and 1000 sharks can keep him busy as well. Flooding the place would help reduce the impact of the bombs as well as slow them down if it's inside. There's also the fact that he can go underground while Deidara won't know where he is as it took the byakugan to find him
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. He can use this and proceed to come out of his blind spot while the clones and shark keep him busy by distracting him. Either way he can move while on air with speed so C2 and its attacks shouldn't be a problem for him at all.
Deidara couldn't fight properly on Itachi encounter because he was trapped in a genjutsu seconds after the battle started, so kisame has little knowledge however basic knowledge on the clay bombs.
Pretty sure he knows the clay can explode
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. That's pretty much all he needs to know
If Kisame has no knowledge on C3 then what makes you think that he will use it to counter a bomb that doesn't look any bigger than a C2 dragon? for all you know he's more likely to waste a GSB on a C2 dragon because of the size. And your forgetting Deidara can detonate the bomb at any time he wants so GSB is technically useless against it if it cant absorb the chakra in time.
You have a point with the bold. I more than believe from C3's size, GSB would be used since C2 is more of a bird for flight and Deidara stand rights on top of it. C3 on the other hand is an attack dropped towards Kisame.
Though that means C3 would be useless since its aim which would be to kill Kisame would be nullified by GSB forcing it to explode before it gets to Kisame. Then again if Kisame is the air, I don't know how C3 would be effective.
Kisame has no knowledge of C4 though and lets face it, he wouldnt be able to out run the radius because last time i checked, deidara sets it off seconds after its on the field.
Sasuke had no knowledge and yet he countered it. If he sees Deidara's position, nothing stops him from going to him similar to what Sasuke did or taking flight out of its range and then Deidara surely can't inhale it as well. Then again, have you seen C4's prep time?
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GSB GGG
Kisame can only absorb C4 chakra if he's fused with Samehada , if they are separated, there is nothing Kisame can do to counter it once its in his system. Im not assuming much, think about it, C4 isn't the first jutsu he's going to use and he will soon realize after going from C1 to C2 that Kisame has the ability to nullify certain attacks and will keep that in mind.
Nothing stops him from fusing at the start of the match with almost no intel.