GoldenKey, I have heard the Whale as Peter theory a lot and had always dismissed it until this. You make some really good points (and I must say i’m impressed with the amount of research you do with just about any theory you comment on). There’s only one thing that makes me think he’s more likely to be Frankie. Okay, maybe it’s more like two.
First off, his reveal is in the Halloween epp if he was peter, that’s not the best timeing.It fits with the Frankie theroy more.
And in Broken, when he went to strangle Regina, that’s something that comes from pure grown-up rage (you don’t see that in children). If he was peter, he would have done it in something of a more trickster way, probably with a lot of teasing involved. Strangulation, however, was a favorite method of Frankie’s monster.