For privacy reasons I'm calling B a friend and going to be vague. Not my story and don't want to possibly cause waves for B.
B is older and has been with his company for 30+ years. He has been essentially on call for a year now and does whatever they tell him they need keeping him out at ridiculous hours and essentially putting his life on hold.
B and his two other coworkers were up for a sizable promotion and all of them have years of experience at their current company and 2 of them are well educated in things that would would be a fantastic asset for the company.
All 3 work on presentations and B doesn't stop doing whatever is asked of him. He knows he isn't likely to get the promotion but figures one of the other two will since they have experience as well as are highly educated. He is ok with this as they really are a good team.
They do their presentations on separate days only to be called on Sunday and told that their boss has hired his buddy for the job. The buddy that has zero experience in the field, no education for the field, but apparently he had “vision”.
Don't break your back for a company. Ever.