Oh, he's not dumb, at least in the literal sense. On the contrary he's got a hell of a lot to say for himself. His trouble isn't his mouth, or his brain necessarily. It's his ears.
At the age of five, Skagra decided emphatically that God did not exist. This revelation tends to make most people in the universe who have it react in one of two ways - with relief or with despair. Only Skagra responded to it by thinking, 'Wait a second. That means there's a situation vacant.'