Paul Barresiis an American actor, movie director, media personality and a former private investigator... (wikipedia)
He would dig up dirt on any celebrity who might be a potential client. Then he would tell the celebrities about the bad news floating around, and he'd get them to hire him for protection.
He felt that he was untouchable. And he also probably felt protected.
He may very well have wanted the dirt to use against Stallone. Maybe Stallone crossed him. I don't know. But I never asked questions.