Team 2 mid diffs. Sasuke can still fight in the Water Dome and he won't be as hindered as Naruto and Gaara are, especially Gaara. So Kisame would mow down Gaara, his sand becomes heavy and useless in water, never going to catch Kisame. Not to mention GSB would plow through his hand and kill him, Naruto too if he doesn't evade. If Naruto uses FRS, Kisame absorbs it when it hits his body or Sasuke tanks with V4. If he uses COFRS (which won't happen when Kisame will be all up on his ass) then GSB just sucks it in and kills Naruto. Underwater neither will be able to counter Amaterasu either.
So their best bet would be to try and take the duo out before Kisame sets up his playing field, but that isn't going to happen.