I know it almost certainly won't go down this way (especially since the zealot is most likely dead), but I would've loved for the resolution of this arc to be them capturing the sven group, forcing the bishop to reveal the results of their research so far to Lucy, only for Lucy to basically say something like "you're just treading old ground, someone already pursued the same exact line of research decades ago, and they actually got further than you did but it still didn't pan out".
Just, really twist the knife in the wound. After all, aside from the bishop (who just seems rather power hungry), the rest of the seem to be participating out of genuine belief in the results of the research. It'd be really satisfying to see how their resolve would crumble if they were to be told that not only is their research unoriginal (and, as a consequence, all their crimes have been for naught), but that it's actually been outclassed without any decent results.