Ok, so here's what happened. First, Sere gained all of the Kirby's lands, and transferred the IAG to Britain, meaning there was no IAG generated from those territories (Indonesia, Aus, NZ etc.), then gave them all to Grim. Next, Sere traded the British Isles for all that land again, meaning that unless he transferred the IAG, Sere had 0 IAG. Then, he gave that all to you. So either your gain no monetary bonuses due to sere joining your league or whatever, and Grim gains 1.3 trillion, or Grim loses nothing. Did sere ever mention transferring the IAG back to the Aus territories?