The kagekage control the whole battlefield: the sky, the ground, all angles of the battlefield including underground. They have a more powerful defense. The sannins summons will definitely get seriously injured and dispelled, while katsuyu, the only exception will be sunk underground. Orochimaru and tsunade that you claim to be immortal cannot survive a sand funeral which crushes the opponent to a puddle of blood. Even the entire sannins combined effort cannot breach Gaara's defense, let alone the combined defense of sand, gold and iron. I could go on but I know you will forever go with the sannins but I like to debate though...
Sounds good, but there's a few things you forget.
Simply sitting on a toad beats sand funeral (this is the one after sand tsunami right? Unless this is desert burial which comes after encasing them with desert coffin?) as the toads are able jump and use water blast.
The sannins have genjutsu which will trap all those kazekage.
Jiraiya has his swamp which would sink gaara and the rest of the kage if they sat on the ground.
The kages do not dominate the air. Water bullets, and giant oil+fire combos are enough to keep the kages on defence in the air. Personally, i do not see anything the kages could do that the sannin can't defend against. And i do not see the kages being safe anywhere.
On ground - Swamps, 1000 snakes, manda traversing under ground and flanking, orochimaru's wind and earth jutsu all keep the kages on defence
In the air - kusanagi, water bullets, frogs generally jumping to them all put them on the defence.
For the defeat, they don't have a counter to frog song which is already a GG for them. They don't have a defence against 8 branches. They won't even survive a punch from tsunade if they slip up.
The sannin have healing (which they don't), sensing(which they have), summonings (they don't have), visual and sound genjutsu (which they don't have), fire-water-earth-air jutsu (which they don't have), enhanced perception through SM, and just generally a larger arsenal than them.
one last thing. Kazekage's iron sand is easily contended with by tsunade as he makes piercing objects and we know tsunade can survive those types of attacks and would be strong enough to even punch some of his sand objects away.
In terms of scale of attacks, the kazekage sort of have this, but scale isn't everything when your opponents beat you in speed, genjutsu, taijutsu, ninjutsu etc etc.
It seems people on this site are biased toward konoha village characters.
It's possible, but then again, they have the most development out of every village. Gaara is the biggest threat on team kazekage imo
