all powers stack

Despotellis + Giantman vs Hiroim + Terrax

Dr Fate + Captain Marvel(billy) vs Ghost Rider + Stardust

Supreme + Sliver Surfer vs Nova + Ronan + Superskull

Atom + Dark Flash vs Superman + Emma Frost

Thor + Wonder Woman vs Fallen One + Morg

Naruto + Sasuke vs Gaara + Neji

Sersi + Firelord vs Cyborg(superman) + Ultron

Hulk + Bloodaxe vs Orion + Lobo



Bonus** Out of the winners who wins a battle royal fight?

H&T win
DF& CM win
Supreme & Surfer win, eventually. Whichever one suffers the double-team is definitely good enough to keep his two busy while the other beats down on the solo fighter. Once the solo returns to help, then it's a one-on-one I think Surfer/Supreme would win.
T& WW, barely
Naruto & Sasuke, barely
S&F win
Orion & Lobo win
Supreme & Silver Surfer would win if everyone fought as a team.
If it was a total free for all, then Naruto and Sasuke would hide using camoflage jutsu techniques and let everyone beat up on everyone else, safely hidden, until the last person was standing, then they'd double team THAT person, defeating them, and finally have a classic battle at the end between each other that ultimately Naruto would win. BELIEVE IT !!!!

I think you missed the subject line "Amalgam Battles" each team is acually the people fused together into one being.

Terroim wins because their powers stack sufficiently to be able to blast through ANY and all of Despotellis's constructs with relative ease.
Marvelous Fate wins. Fate's contributions in magic surpass Stardust's abilities or at least match them, while Marvel's abilities surpass GR's, IMO, which makes MF the amalgam that wins.
The Surfer Supreme wins. Blending of a passive aggressive Surfer and a highly aggressive Supreme creats a relatively aggressive Surfer Supreme who has cosmic powers as well as considerable strength to slug out with. Meanwhile NovaSkrull the Accuser w/Universal Weapon has considerable stacking ability and a weapon that could match the Surfer Supreme's BFR capability. I think this comes down to sheer desire, and Surfer Supreme has it in spades.

Thor-Woman beats Morg the Fallen in a VERY close match.
Gaara's mother inhabits his sand, which protects him and only considerable speed is capable of penetrating that sand or considerable strength. Sasuke has the speed while Naruto has the strength. Neji's contribution to Gaara really isn't much more than what Gaara already has with his sand. If anything, their abilities stack is all. Meanwhile, Naruke's abilities can stack and overall increase thier potential, unlike Gaaji's who seem to duplicate the same abilities just in different ways.
Fiery Eternal wins over SuperUltron mainly because of the sheer power of Sersi's cosmic power transmutation abilities augmented by Firelord's considerable Power Cosmic abilities.
BloodHulk is a considerable beast, bloodlusted by his weapon and rage, however, I think Lobion the New God would still have what it takes to humble the Bloodhulk.

I still think the same thing would happen. Naruke would utilize stealth ninjitsu to hide until all the other players have worn themselves out battling each other, only to have Naruke emerge to take on a tired and worn out winner to secure the win. It would still be a hard fought win, requiring Naruke to summon the monstrosity King Snake (amalgamated King Toad and Snake) to assist. BELIEVE IT !!!