Possibilities 2 through 4, while theoretically possible, are highly unlikely based on fairly basic observation of human nature and how secret power operates. And because it's all secret, we're entitled to make the most ungenerous guess.
As an aside, I'd imagine that in previous days without these public advocates, the government would have bent over backwards in choosing submissions judiciously, to guard against the obvious perception that the court was being abused. But now perceptions are different, and they can (from a PR standpoint) afford a very small amount of fighting with the public advocates. So maybe now they'll push the envelope a very slight bit, see where the boundaries are.