When Ozone and Hark died, our most prominent detectives have yet to mention that one of them was a mason. Go ahead and look. There's only three of them left.
Mason is a separate role. You can't be both a jailkeeper and a mason. All 3 masons are still out there.
Oh. Well, my apologies go out to Waff for arguing out of ignorance. Somehow or another I thought there were originally four.