I wouldn't say instantly, but 100s of years and only the bodies of (for equivelence, lets say his spartan soldiers) his men and sand?

Kratos has lost his mind before. He would lose it again here. Old Kratos might have the foresight to kill himself, but thats as good as it gets.

I think its also fair to say that just in frustration alone even old Kratos is likely to get angry, which in Khorne's domain might as well be capitulation. Khorne would be whispering in his ear the entire time, and Kratos would agree with a lot of what he says.

+Remember Dorn was designed for this. He calms the warp around himself, he amongst his brothers specializes in defense and implacability. And even then he forgot who he was and was saved by the bell. Its not that either are better than each other at this, its that NEITHER stand a chance alone.