Hmmm mei is 4th mizukage, but team 2
Muu>Onoki
Gaara>Dad
4th Mizukage<Mei
Hiruzen<Tsunade
3rd Raikage>A
So the old kages forsure
1. That would result in a draw.hiruzen can go into diamond cage and let tsunade whale on it. then finish her off with clones + death god
muu kills onoki no problem
yagura is a perfect jin and has bijuudama
A is slightly stronger than his father
gaara already beat 4th kazekage but outside of a desert it may be a different story.