There's like 3 superstars in the sport, Conor, Brock, and Ronda. In all of MMA history I guess GSP was at one point, Chuck, maybe Bones, Anderson, and Kimbo.
I think(hope) you're using hyperbole. What would make him a superstar? What does marketed right mean? The UFC put a lot behind him and obviously they didn't see the return they expected. He'll put on exciting fights and maybe get Bellator a little footing in Mexico a bit but I'm pretty sure everyone that's super hyped about him now is a hardcore MMA fan and their excitement is in large part due to how the UFC already tried to hype him up. And I don't see anyone becoming a superstar fighting on paramount TV and Country Music Television.
I always mock UFC failed hype and them trying to fabricate hype and push guys but it clearly worked some at least on this niche MMA site for Yair.