Yup. If any part of the hints pay off? Super fascinating addition to the myth. But as of right, he's kind of just a big nothing. Pretty inoffensive for the most part, but lacking in a much needed clear and distinctive hook to inform his character.
Maybe if we'd have gotten a bit more on his past service to The Circle? Get him in his element to show more personality, but don't touch the mystery. That's really the thing isn't? We you have a character that's intentionally supposed to be some sort of an enigma they then live and die their personality and actions. And there's stuff there. He's not actually just a big rage monster who can't hold a conversation, but we don't press on that as hard as I'd like to distract from not knowing his deal.