Wiv Gaz. Dat Yarrick fella did looze sum. But den he hit back 'ard against Gaz! And den Gaz hit 'arda against Yarrick. Out of all dem Umies, we dont mind da Yarrick. Least 'e knowz how ta Waaagh.
Even I'd hate to admit, it would be Eldrad who would win. Man he's a psyker of immense power, he almost would've killed the Despoiler before. Beside those two, Green skin and Smurf King has only power of pure strength to present themselves. It's no match. Purely my oppinion, hope no one get ferocious by it.
As was said earlier, I think if it was all of them, fighting at the same time in one place, I would bet my money on Eldrad. He has gift of foresight, psychic powers and pretty much master trickster. However, I would say that Gazghkull has best shot right after him, why? That is quite simple, Gazghkull is, or so he claims at least, champion of Gork and Mork. So he doesnt just bring raw power to the fight, but also low cunning. And as we all know, Orks are no strangers to backstabbing and cheapshots if it suits their needs. He would probably wait for Abbadon to be battered, seeing him as most dangerous and worthy oponent and then pummel him. Just like Grimgor Ironhide pummeled Archaon Everchosen in fantasy warhammer. Another reason why I would go with him over anyone else is simply because Orkz is made fer' two fings! Fightin', and winnin'!
Eldrad is a crazy old man almost turning to crystal, and depending on what lore you believe, has already moved on having sacrificed his mortal body to fight a trapped C'tan on a blackstone fortress. But retcons a funny things Still I can see Eldrad standing there before the others and saying, "I can kill you with my brain"
Whoever wins would probably get "collected" by Tazyn afterwards but my Money on this one would suprisingly be on Eldrad after all he probably would let the other three fight each other first and after that would attack the weakened winner