Good thread, however the only bit I can really agree with you is that base bee, without samahade would loose to kakuzo.
Lets talk about v2 chakra cloak
- do you really think kakuzo's penetrating lightning justu is fast enough to tag killer B?- I believe cloaked killer B blitzes kakuzo with a lariat- and tear open his chest.
-Kakashi was able to intercept the lightning attack after it was fired, and activate raikiri---- I highly doubt it could even touch killer B in cloaked form.
However I will concede this point: If you consider that Kakashi's lightning chain cut the chakra arms, then it is very possible that kakuzo's raiton attack would hurt killer B ( it it hit). The problem is that you are power-scaling kakashi from pre-kage summit to war arc kakashi ( it is obivous that kakashi improved tremendously over this period of time).-Furthermore, you are comparing different justu ( lightning chain vs raikiri).
Conclusion- when concerning v2 killer B, it is plausible that Kakuzo's raiton attack will harm him, however I would counter that cloaked Killer B would be too fast to be hit by kakuzo's attack.
Now- lets talk about your last points- Full Biju Mode.
First, I can see your point relating to forcing the bijudama away- it plausible.
-So, kakuzo may be able to counter a fired bijudama, however- considering killer B can survive a bijudama point blank- what stops killer B from fireing a bijudama straight at the ground???- the exploision covers atleast the distance of a mountain, so kakuzo gets nailed by the AOE.
Your point about countering a fired bijudama makes some sense, however- bijudama arenot slow, It wouldnot be easy for kakauzo to hit one with a pressurized wind justu- lastly the bijudama can be fired at the ground, then kakuzo has no counter- another problem is that- I understand somehow hitting a single moving bijudama with wind justu however what about this-
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-do you really believe kakuzo could get off 4 wind style ninjustu that fast- ( remember, he has to hit the bijudama just right in order to send it away in the right direction)
Anyways, lets say kakuzo does somehow counter the sphere bijudama what does he do against this:
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-kakuzo isnot dodging it- the attack is clearly wider than the eight tailed ox- making the beam at least a few hundred feet wide- that means its massive btw.
Kakuzo gets slaugthered by the beam variant bijudama---for four tailed Naruto Orochimaru needed rashoshom to defend against it- Kakuzo has nothing like that in his arsonel.
-I might be able to agree that kakazu could beat killer B in base, and in v2- but I highly doubt he would stand a chance against Full Biju Mode killer B.
FYI- Don't know what you mean to say about mentioning gaara; but Gaara slaughters Kakuzo low-diff if they are in the desert.