Yes, "main character" is Twitter jargon not normally used in business.
However, it is true that the manager often represents the team in meetings. To the other people in those meetings, the manager may be the only person they know on the team.
An extreme version of this: outside a company, the CEO may be the only person the average person has heard of. Who do you know who works for Tesla, besides Musk?
Or consider the inventions attributed to Edison. Could you name anyone else who worked in his research labs?
However, it is true that the manager often represents the team in meetings. To the other people in those meetings, the manager may be the only person they know on the team.
An extreme version of this: outside a company, the CEO may be the only person the average person has heard of. Who do you know who works for Tesla, besides Musk?
Or consider the inventions attributed to Edison. Could you name anyone else who worked in his research labs?