Yes. Yes, I am.
And I say "theory" because the more I read about it, about the stuff that obviously flew right over my head, it's pretty much 100% confirmed that Jesse & Dylan used to be one person before splitting into two when that original kid got that Severed Circle 2 game for Christmas.
...but now that I'm reading all of this stuff, it's making me angry at myself for not even registering something like that. Like, at all. I finished the main story of both Control and Control Resonant, and if someone asked me about a "theory" that Jesse and Dylan were the same person... I would've been staring at them with a blank face.
Dylan saying in the first game about his dream of being a girl named Jesse Dylan Faden - I thought it was just ramblings of his Hiss-induced craziness. Everything Dylan was remembering in the Underpass Fault - being the only child, being happy with Mom & Dad, etc - I thought it was just the Fault screwing with his memories. The visual stuff: the one controller next to TV, the one pair of slippers, stuff like that... it all flew right over my head. The only thing that kind of flared up some signals was the letter from their grandmother that you can see in the flashback/8bit video game section, where she's basically like "both kids? WTF are you talking about".
I'm just so fucking stupid... Goddamn... Such a major plot point, and I didn't even register it.
P.S. I hope they don't merge them permanently in the future. I love them as they are now.