I don’t think the Neighborizer has to be town. I know WF subscribes to the same ideology as me and Luna that confirmable roles aren’t necessarily town roles.
Vanilla is also clearly an outlier when everyone else has a role.
My theory assuming that Ceru is town (which is likely now with Wryly’s flip) is that scum knew there would be a Town Watcher/Tracker. And the people more likely to believe Ceru were more likely to be that role. Which is why Luna was the NK and REF chose to chat with Wryly. They were the only two if I recall that were hesitant on lynching Ceru that day.
Of course this assumes a Gravedigger exists in the first place, which is why I hate being in this position in the first place, but no one ever listens to me