Why three? The rule of three is catchy, even if different relatively in different cultures. It's been a rough rule within writing. I'm basing it off Ronald B.B. Tobias character small aside on characters within his plot book. ( Will review the book.)
Three main characters, the more main characters, the more there is to worry about concerning monologues, dialogues and trialogues. All concerning dynamics one must juggle in concerns of the relations of the story.
For this, Couch the advertising model, Jaime the agent, and Bobby the starter of golem job creation franchising.