The leap of faith goes further. In order to side with the Absolute and/or the Minthara-led attack on the Grove, you have to discard the Halsin card. Even if you've tried other options for a cure, there's still this one that you haven't checked out. Assuming you can successfully infiltrate the cult of the Absolute (a first and huge if), it's not at all clear (in fact, unlikely) that you will find an option for a cure/control. I think that trading a closed box guaranteed to contain a potential solution for a closed box that does not offer this guarantee is just a bad decision.

Flash info : The Dark Urge is not an Origin Character. And it's not a new concept.