Those Children of Rydia who haven't claimed could well be vanilla townies, and therefore are likely to be claimed, if not all ready claimed, by the vile wicked cult.

[M] Diablos
[M] Levaithan
[M] Odin
[M] Phoenix
[M] Ramuh
[M] Siren

I suspect some of these to be part of the dark empire, however, I do not believe there is any point in hunting for regular Cultist defilers just yet. Even if we purge a foul one each and every day, we will still lose, simply because we are losing a townsfolk every day to the cult. They have a net gain of 0, we have a net loss of 1. The Dark Priest has to be our target. Once he has been cleansed, the rest will then be eliminated.