I don't think its his manager as they don't effect his fight. Its has to be number 2, add that in with the pressure and the media it would kill you. The man did fight under the radar for years. MMA is so big now that he is getting heat from everywhere.
Yes the pressure is high for sure, I admit that. But his managers where responsible for not signing with the UFC when PRIDE went down. He would still have being competing with some great fighters and get keen to the hype, and media that surrounds him.