Nobody complained about team-ups last time... ah well.
I'm keeping with what I said before about keeping Ganny and Link out of this, as well as the witches. They're trump cards.
Well, if we're doing it this way, then we need some sort of inciting incident. I'd say the City in the Sky crashing down in the middle of Hyrule Field. It's technology. People would view it as a weapon that they could use. Racial tensions are at an all-time high, despite the efforts of the sages. This leads to an all-out battle in the middle of Hyrule Field.
For some reason we have the Deku and the Ikanians there. Because Zelda.
First of all, may I say, the Kokiri are screwed. Are we all in agreement? Good. Moving on.
The Deku wouldn't last long either. They're not very sturdy, and don't have many weapons.
The Zora are good fighters, and don't need the water to do good stuff. Assuming the Ikana are coming from the forest, and saying the Twili come out in that giant gap between the Hylians and the Gerudo, let's say they start attacking the armies next to them. Therefore, round one matchups:
Hylians v Twili and Gorons
Gorons v Hylians and Zoras
Zoras v Gorons and Ikanians
Ikanians v Gorons and Gerudo
Gerudo v Ikanians and Twili
Twili v Hylians and Ikanians
Despite a lack of Ganondorf-magic, I feel an army of Zants would beat out the Hylians. Edge: Twili.
Gorons would crush Hylians like bugs inside their puny tin cans, and would laugh at their toothpick swords. Edge: Gorons.
Zoras would probably get punched by the Gorons, and their spears wouldn't do much. Edge: Gorons.
Ikanians are many, but easy to defeat. The only real threat would be the Captain, who would be taken down eventually I'd think. Edge: Zoras
Gerudo would fight Ikanians. See above. Edge: Gerudo.
Twili have armor. Gerudo really... don't. Edge: Twili.
So, coming out of this, we have half the zoras, half the Gerudo, all the Gorons, and all of the Twili. The Hylians are down for the count. Honestly, the remaining Zoras and Gerudo wouldn't stand much of a chance against the other two races
So that leaves Twili v Gorons. Twili are probably using a lot of magic, which I'd think the Gorons aren't immune to, so Twili win.
The Twili approach the City in the Sky, ready to take its technology for themselves, when they come across the guardians of the City: The fearsome Ooca.
Actually, ooca have no arms. They can't even really fight. **** them, they die.
Twili win.