Doom horrors have a will of there own and are not mean't to be controlled by even gods. Even if you somehow mange to control one, it will only be for a brief time before it turns on you and goes its own way.
Actually, I think it's due to Kurgi having the #immobile tag. That'd explain why he won't move even though he has mapmove. This is a quirk which also works for Oracle and other immobile pretenders (Oracle with Flying Carpet has mapmove 1 but can't move).