I liked those theories of Wendy and the HO, or even Igor (Victor’s buddy) rounding up people from realms where folks were missing, but now I think it all boils down to PP was manipulating GregOwen and Tamara (GOAT).
None of the “science” stuff they had was actually science, but magic all along, that taser, the cuff, even the “app for that” they followed in the mines. Magic all of it! They were, as Rumpel says, merely unwitting pawns of the real big bad, PP.
So unless it turns out that GOAT are actually playing PP, something neither Gold or PP realize, and there is actually an anti-magic organization out there, at the moment it feels like the HO is just over as a plot development other than GOAT learning they’ve been duped.
“If I had a world of my own, everything would be nonsense. Nothing would be what it is, because everything would be what it isn't. And contrary wise, what is, it wouldn't be. And what it wouldn't be, it would. You see?” -- Lewis Carroll, Alice's Adventures in Wonderland & Through the Looking-Glass