That is a difficutlt one
Gaara is a fairly bad match up for minato (gaara losing), his offensive sand attacks would most likely not land unless they are of a very large range which minato would have to escape the battlefield itself.
However if they are in a desert i can see Gaara winning
Gaara's ultimate defense could help him extremely and is his only way of actually staying in the fight is through his defense which acts automatically.
Intresting point about the finger sensory technique
What if there is a body of water nearby and the Second Mizukage merges with it?
It would mean that the Second Mizukage cannnot be detected as he has become the whole body of water itself so the technique would be useless if the Second Hokage tries to use it to sense him in that sense
Also the second Mizukage also has a version of S/T using his Hozuki technique which combines both Tobi's and Minato's S/T Techs
Here it is:
-Teleportation (if the terrain is covered in water)
If the Terrain as a substantially large water source nearby or itself is a water source, then the Hozuki nature transformation can be used to travel into the water and reappear anywhere in the given water source quicker even than the flying thunder god technique as soon as the caster of the jutsu includes themselves into the water source, they are already anywhere and everywhere on the battlefield.
But eventually minato would get use to it and get around it, Gaara can't really go on the offensive without leaving himself really open and prone to a one hit ko rasengan.[/QUOT
Yea but minatos attacks probably couldnt land a hit on gaara with his defense there would be no way for minato to even place a seal on him and if he did the rasengan that he is able to use wont completely win the fight because of gaara covering his body with sand also in the movie which isnt cannon but is able to move very fast by turning his body into sand
I know but the key factor which lets Minato win is reaction time
Can Gaara's sand react to something faster than it's reaction time?
Gaara's sand can't be infinitely fast in direct proportion to the opponent's attack meaning he would be hit by Minato's FTG Tech
Though there are many Kage Gaara would destroy
Well, as many have said, we more more about the Mizukage than the Hokage.
But even so, Tobirama seems to be slightly stronger.
But, the Mizukage is just a bad matchup against him, as Tobirama's water techniques will just be abosorbed by him.
So I say the Mizukage wins mid-high diff, until we know more about Tobirama.
One thing though, wasn't Suigetsu's jutu that alters his body due to experiments from Kabuto and Oro?
Nah Kabuto and Oro's experiments weren't on Suigetsu, they were working out on how to extract the gene which turned bodies from solid to liquid, no alterations were made to suigetsu himself
Eventually Kabuto did it and now he has the gene within him