Well a good POD is to not have Stilicho killed and or not have the great backlash in Italy against everything Germanic and all Germanic people in Italy.
But if you want the latest POD, simple. Don't have Saurus try to attack and kill Alaric, and a deal will be reached. All Alaric wanted was concessions. I.e. the gold stilicho had promised him (which contributed to his downfall) and possibly, though I am not sure, a different place to settle other than Pannonia.