Honey, not vinegar. Advocate to management that they be promoted as soon as possible, to a role where they are less involved day-to-day with you. Get your pee

Honey, not vinegar. Advocate to management that they be promoted as soon as possible, to a role where they are less involved day-to-day with you. Get your peers in on it. Focus on fear and greed to keep their golden boy employee onboard and not having to replace them. At the same time, try to get them hired at another company. Find some good recruiters (not the ambulance chaser phone spam variety) and pass their resume around. If your coworker gets wind of it, you have an honorable, believable, and selfish motive: the spiff from the recruiter if they get hired. Sometimes the best way to push somebody away/out is to push them up. It comes off as positive instead of negative too. Win win.