lol, there probably is a thread, but it’s perfectly fine. There are probably 50 threads for this topic by this point and I don’t expect you to wade through them all. The only time I would redirect you is if there was an active thread about this already happening, so don’t worry.
As to your theory
A couple people have had the idea that Henry is both PP’s and Rumple’s undoing and I like it but I think Rumple’s will be his own undoing by saving Henry from PP.
Also, I think GOAT are woefully misinformed about their mission. They think they are working for an anti-magical operation, but now that we know (apparently) that PP heads this Home Office, they can’t be anti-magical at a deeper level given PP’s propensity to rip people’s shadows from their body.
I think PP is going to try and Henry’s Shadow (because it’s very speical) but Rumple will step in and stop PP and give up his own Shadow (at least the Dark One’s shadow), thus losing his magic.