Not really sure about that. When Jules retires and the Butch affair comes along, Marcellus goes to the apartment with Vincent…perhaps because he didn’t have anyone else he could send. And Paul is the one who informs him that Butch escaped. A fucking bartender had to inform a crime boss about the whole thing. That for me shows he didn’t have too many guys employed with him.
I think English Dave/Bob, I forget which (His name’s not Paul damn it) is more than just a bartender, he’s probably a close friend of Marsellus’ also.