Timing was everything, at least for Arella. You could still give her a religious nudge in a similar direction, but the imminent threat would be more localized and er... human.
Timing is everything with all of this, as well as a judicious use of both carrots and sticks. Whether Jenred will be in a position to offer either when I come back is highly in doubt, especially given how much Arcaea's internal politics have changed even from what I've just seen on the forums, and how much bad feeling remains about his attempted treaty with Arcachon.