An unfortunate situation for sure. It sounds like you as the commish may have a practical political angle you can work. Sounds like you could realistically go to guy 2 and say, "Look. Guy 1 screwed up. He is new, and it was an innocent mistake. On one hand, it was his mistake, and that isn't your problem. But on the other hand, it was *really* disruptive to balance. Lots of owners are upset, and if it goes to veto it will probably get overturned. So you could do the good guy thing and agree to revert the trade, or take your chances on the veto if it comes to that. If you do the good guy thing, I'd think it would get you good karma with other owners going forward." In a pretty relaxed, laissez faire league, he might make your life easy, concede the point, and agree to just back it out.