I'm afraid the GSA is here to stay.
That seems pretty darn clear and the only way that I can see that the judge would go back and re-open that issue is if new admissible evidence comes to light somehow clearly demonstrating that the GSA was negotiated in bad faith.
Yes, I can see the posts now: "Of course it was negotiated in bad faith". Really? Says you. But what new and admissible evidence do you have supporting that assertion? Not existing evidence. New evidence. And, how, procedurally, do you plan on getting the court to admit it and review it? Because that is what you need.
My point is this: without something new to show the judge, that issue is now pretty much in the grave.
Maybe, if there is no settlement in the near term, during the discovery and trial of the IT issues something new might come out, but I wouldn't count on it.
BTW, I believe there will be a settlement. Possibly before the district court judge issues a ruling on the hedgies' appeals. And from my review of some cases where these types of appeals have been filed, the district court judge seems to be pretty quick about giving a ruling, within 10 weeks after the appeal is first filed. Before Christmas.