I'll start with this one.
The Full Moon Brotherhood was to be the next branch of the Fourth Ring come to destroy Gomorra. Ivor Hawley and his circus was the first. It just so happened that the next arrived shortly after his failure.
Lycanthropy was a theme for the group, yes, but it was more than just that. They are a group of predators who live for the hunt, gaining strength from every kill, similar to the way that Harrowed characters "count coup" in the RPG. This means that, strangely enough, they actually seek out powerful creatures/abominations to hunt, even though many of their own ranks are creaturely themselves. Of course, man is at the top of the food chain for a reason, and often times they can be the strongest prey around. Hopefully with Christine Perfect and Absalom Hotchkiss, the players can see how that idea was developing mechanically.
Mason Adler was to be the new Ivor Hawley. He is the "apex predator," gifted by the Reckoners with power due to his predatorial nature. He is a lycanthrope, but in many ways unique in that. He is not governed by most of the rules that govern lycanthropes in the setting and he gets more fearsome every time he manages to kill someone stronger than he is.
The rest of the outfit (including Mr. Kevin Wainwright) is made up of either similar abominations or cultic followers that aid the others in the hunt.
To be sure, Adler's dynamic with Gomorra would have been very different from Hawley's.