Spider-Man 3 Villain Theory

So we aren't getting Carnage DLC for Spider-Man 2, I know that sucks, but it gave me an idea. They're clearly setting up Green Goblin for the third (possibly final) game. They also have Cletus Kasady who's obtained a red symbiote at the end of the cult missions. So you know how the first game had Mr. Negative, and also set up Venom? That led to Peter getting the Anti-Venom suit. What I believe Insomniac is planning is that they'll have Carange and Green Goblin in Spider-Man 3, and then the two will fuse into Red Goblin.