and he has clones.
plus he knows about ftg so he'll prb have a sub ready because he knows that whewre the kunia thats where minatos gonna appear he'll be ready
lol. U r setting up the stage for kisame show.That way even sakura have a way to defeat sasuke. You can't do that in vs match. All we can do is counter one's technique with another's with valid arguement, not a set up. If you want a example, i can really set up a match where sakura can defeat sasuke !!
Lets have it ur way. According to what we've seen in manga, Minato always scatters his kunai through out the battle field. He will do the same for kisame and thus escape the water dome(if kisame stays alive long enough to use that jutsu). Than he will cast S/T Barrier to prevent the water dome. Then he cant just summon frogs and use those big atacks they(frogs) use and finish kisame. Even if kisame somehow manage to survive that, He can't keep on the dome forever. AT the moment he cancels that jutsu, kisame is dead. So any how kisame looses.
Now according to my set up, Kisame looses for sure. But i don't know how the battle will proceed, neither do u. So we can't just make a set up like that.
If you r fighting against minato, U must take the first hit,than survive(like 3rd raikage,madara,pain,current naruto).Next is to disable his FTG(like pains share field of vision). Kisame's dome has a chance to disable FTG, But that's farfetched. He can't take the ist attack and survive.
Minato can be defeated by some. Kisame is not one of them.