At the Hughes' home, Jimmy managed to enjoy a dinner but refrained from drinking alcohol. He had to drive home and take care of the kids, so he didn't dare drink too much, just a sip of beer while chatting seemed harmless.
Leaving Hughes' place, Jimmy had already envisioned the end of his career path for the next few years. Clearly, some people had consulted Hughes on this matter, whether out of respect for him or because of Jimmy's relationship with Hughes. When considering Jimmy's future direction, they had to take into account Hughes' opinion, and what Hughes said was likely already a consensus they had reached.
Don't think just because Hughes isn't the head of the New York office that he holds no status. Anyone who has been rehired multiple times and has firmly seated as the Assistant Supervisory Special Agent, having been with the FBI for over 30 years, surely isn't to be underestimated.
