Imagine a monster battle between WW, Mundo and Zac.

Since Mundo "cures" people with his mear cleaver that must mean it has blood on it, which means if Mundo and WW were to cross paths they would almost surely battle. What would be great is that all the destruction and fear they would cause in zaun would throw zac in a frenzy. That way you would have a three way battle between these three monsters.