Wow O.O alot of points going across. Well, this is my first ever post, so don't mock me Dx Personally I think it would be very close, but Kisame would win. In my opinion, don't start having ago at me.
Firstly, Kisame can make a large water dome, as we have said. Now, Minato needs to come up close and personal to attack Kisame. Even if he did use FTG against him, the kunai he uses would get caught in the water and just float? Meaning even if Minato used FTG he would just bring himself into Kisame's grip faster.
Secondly, Minato has only showed to be able to also use the Rasengan. Another up close and personal jutsu. This also goes for sealing. Kisame can fight at long and close range, meaning even with Minato's speed. Kisame pawns him!
Third and final, if Minato decides to go into the water to fight, he is screwed. Kisame is far more powerful in the water, plus, it heals him. Unless Minato has a element? Maybe high power fire to make the water evapourate or earth element. I can't see Minato winning any time soon.
Thanks for reading, I look forward to seeing your arguments. All one liners will be ignored, now. Nap time! Zzzzzz