Then why was Scorpion given powers?
Scorpion wasn't mere mortal. I think he could master some hellish powers "down" there.
Or maybe (more dramatic), it's the power of revenge.
Notice how Quan Chi never tried (and maybe he could if he did resurrected) strip him off his powers.
Many other souls who died and went to the Netherrealm became wraiths with powers, and I'm sure Quan Chi didn't resurrected most of them, because, well, that's the place role.
So in other words you just made all of that up?
Then why was Scorpion given powers?