Well lets think about it. Would the doom slayer be able to kill the things Kratos has killed? And would Kratos be able to kill the things that the Doom slayer has killed? The fates from God of War for example, they had the power to erase anything from existence. And they threatened to undo Kratos's existance with the snap of their finger (I think it was that simple). And Kratos still beat them.
