Imo the Gokage win.
They not only have the numerical advantage but also teamwork on their side.
Canonically Gaara > 4th Kazekage w/o much trouble, which will soon make this a 5v3.
Muu's invisibility and the 2nd Mizukage's clam are countered via Gaara's sand sensing and also Mei's mist, in order to avoid surprise attacks.
Joki boy was also canonically countered by Gaara.
The 3rd Raikage would be the biggest problem, but Ay can stall him long enough for the others to take care of their business and then gang up on his dad.
Tsunade isn't even needed.