So far throughtout the whole series Konoha has always been the top dog.. Mostly due to their Hokage.. Hokages have always been stronger then Any other kage ^.^
Plus the second mizukage didn't seem that impresive against gaara at all.. The way you wrote about him makes him sound OP. Also S/T ninjutsu xD.
Lol re-read the thread you will see there aren't any theortical techniques
e.g. if its a completely water based terrain, he'll take this without much difficulty
If its a terrain close to water then he still gains the advantage
Also did you read my point on teleportation by the Second Mizukage?
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.