They see John L Sullivan playing checkers with Usyk. Usyk and John L challenge the three giants to a no holds barred scrap in the cellar. The three giants accept. Once they all enter the cellar, they see Jim Jeffries in a cage. John L grabs the keys... Who walks out alive?
I think Valuev's size and awkwardness/lack of coordination and speed would actually be his undoing in a narrow location like a barr cellar. He might last a while due to his strength and chin, but he'd basically be a sitting duck in a brawl in a room with a short ceiling and furniture everywhere. Carnera gets KO'd fairly quickly. Usyk lasts a while due his modern technique, speed and stamina. Not too sure about his durability since no one has truly pushed him to the brink so far. I think it boils down to Jeff vs Sullivan. Not too sure about that one. Willard is a wild card since he had unusually high stamina for a big man.
I think Sullivan and Jeffries team up. Together they pounce on Valuev but it is John L who brains Valuev with the butt of his silver hip flask. The beast from the East is no more. While this is going on Carnera wrestles usyk to the floor and Willard stands on the Russians head with his cowboy boot. This enraged Primo, offending his natural sense of fairness. The two remaining giants then eliminate each other in an exhausting battle leaving John L and JJ to cunningly finish them off before celebrating together upstairs over cigars and whiskey. But after a few drinks John L becomes predictably irrational and goads Jeffies to fight him. Big Jim is about to retaliate when in walks an off duty policeman who shot Cleveland Williams. He has his trusty 57 magnum ready and his trigger finger is still itchy. As he takes aim at Sullivan the bar tender ( Tony Galento) leaps over the bar knocking the Cop into the spittoon. A truce is made between the fighters just as Leon Spinks (naked apart from his sunglasses) crashes his car through the wall of the saloon killing everyone in the bar.