I would say that the Third would win unless Kisame casts Water Prison Shark Dance Technique, as the Third wouldn't be able to use lightning release or mode because it would fry/shock him and he would die. Without his lightning he wouldn't be nearly as powerful or fast and Kisame the "tailless tailed beast" would have enough power to overwhelm and defeat him.
TheOneWhoLovesNaruto wrote: I would say that the Third would win unless Kisame casts Water Prison Shark Dance Technique, as the Third wouldn't be able to use lightning release or mode because it would fry/shock him and he would die.
Kisame would die, too. And since there's no restrictions, I could see him doing kamikaze attack to kill Kisame, heck, that's how he practically died in canon.
Kisame may have almost defeated B, but Gyūki's jinchūriki was not going all out in order to avoid injuring Sabo and Ponta. The Third is too fast, and while Samehada might absorb a lot of A's chakra, it probably wouldn't be quick enough to nullify the nintaijutsu attacks. Kisame has little to no chance of winning.
Ishi208 wrote: No restrictions and both are alive not edo tensei
third has element advantage and is even protected againt higher-lvl attacks who are also stronger element-wise...
kisame wont be able to do much even with his gaint water jutsus :)