That's not how pay works at unions. A union meeting is held to elect union members to a negotiation committee with your BA present for each local region. That committee then negotiates with the company for contracted wages, benefits, safety concerns, and length of terms on contract. If an agreement isn't made, they strike or remain unsigned. If an agreement is made, the contract is brought back to union members to be voted in as a whole.
There is no "union boss" in determining what a worker deserves. It's determined by the union body itself and the spine or lack thereof of the people elected.
I can tell the lack of experience in dealing with unions can shroud opinions of them. But it's equal to running your own company and negotiating value to labor force for the job you employed yourself into.
The BA is there to handle legal and corporate communications should something run off rail. Your union dues are paid to employee that mediation service, voting service, and legal service, to stand behind you for contract compliancy against corrupt supervision.
As much faith as people have in Elon Musk, not everyone in his company is Elon Musk.
Any job as "non union" is a joke and those that go that route will stand with zero backing should the worst happen. Companies wad people up and throw them away when they have no use for them. "That's business." Years of service, experience, or in my father's case, shipping his job to Taiwan, because training and keeping someone to do a job with tighter tolerances than what C&C lathes can do, even still today, is easier than keeping him around... yeah I'm a little bitter on the topic. Anyone that can fault employees for wanting to unionize, never understood the full reason for why people do it or got mislead as to what it actually is by talking points and brainwashing at anti-union companies worried about their overhead costs and bottomline (which they can afford but just don't want to.)
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