Off the top of my head, I can think of two immediate benefits to this idea:
1) It'll allow us to gain some insight into the setup, which is crucial to determining what Desperado actually was so we can move forward from that. If we come to the conclusion that he's factional scum, we can do the usual thing where we mine his ISO for interactions, etc.
2) The Desperado situation makes me think that either scum didn't have fakeclaims (probably more likely since I remember this to be the case in the other FG game I looked at) or that the mod simply fucked up. If it's the former, a massclaim would really box the scum in with what they can claim which can further our PoE.
Since Marangal's already been outed, I don't think we stand to lose a whole lot with this plan and I think we can gain a lot.