Yes, they are a large enough group. Not Zhentarum level, but certainly regional. They were as far south as Amn in the original game. You can find a book in the game indicating that they trace a lineage back to the Faldorn who was a member of the Cloakwood group. And if we can count among our allies who promise to aid us in our battle groups like a Deep Gnome clan and the Myconids, I don't see why not. The absolute is a threat to the Shadow Druids too (if you side with Minthara all the Shadow Druids and Kahga end up dead-they make no distinction) It is absolutely in their best interests. Besides, if we do them a favor, they can do a favor for us-even evil groups understand the value of allies.