Its because we are from the one Order that has unoffical relations that they would even talk to us.It was required for the ritualistic parody part of the murder:
If only we belonged to the one Order that has unoffical relations with them, and had a divine artifact to make them trust us on top of that...
and yes, if the Father works that would be great, and im up for trying.
but if the father doesn't work, I'm expecting a few hoops we have to jump before we get to favour trading.