Definitely not. Brubaker is purely fictional. The story and its elements were made up to entertain and engage the audience, not drawn from real-life events.
Sure, it can be normal. Just like any person might be interested in what others write about them or their alter - ego. It's a way to connect with the fan community on a different level.
Well, the 'brubaker true story' might be about a particular Brubaker who had a unique experience. Maybe it's a story of struggle and triumph. For example, if Brubaker was an artist, it could be about how he overcame difficulties in the art world to gain recognition. Or if he was an athlete, it could be about his journey to compete at a high level. But again, without more details, it's just speculation.
The best Ed Brubaker story for me is 'Gotham Central'. It was a refreshing take on the Batman world. Instead of focusing on the caped crusader all the time, it was about the police officers who had to deal with the aftermath of Batman's battles and also handle their own cases. 'Sleeper' is another excellent one. It has a great concept of an undercover agent in a world of super - villains. The moral and ethical dilemmas the character faces are really interesting. Also, 'Catwoman: When in Rome' is a great story. It gives more depth to Catwoman's character and her backstory, especially her time in Rome.
Well, it could be a way for the daredevil to see how others perceive their character. Maybe they find it interesting to see the different scenarios and relationships that fans come up with in the fanfiction.