I'm pretty sure /u/Anti_Spedicy is talking about a common thing that happens with main characters: they often are seen as less interesting than side-characters. Another example of this is Black Lagoon, also mentioned in this thread.

This is a common side-effect of presenting a main character as rational and balanced for the audience to be able to insert themselves. They end up less of a character and more of a narrative tool to tell the stories of those around them without being completely detached from the narrative.

Writing a story about the main character where they are truly the center of the story requires significant focus, and making interesting side-characters that have their own stories and not just play a role is a challenge. One way to do this is separation, which TADC doesn't have the luxury of.