Focused Writing

In the book Jimmy Corrigan, Chris Ware does not allow us to see the faces of all characters that are not the main characters. Ware uses many different creative ways to obscure the different characters' faces. In one case he places a speech bubble in front of the character's face so it is not shown. What is the significance of obscuring these characters' face?
According to Scott McCloud in Understanding Comics, comics are given life by us the readers. McCloud says that “you give me life by filling up this very iconic (cartoony) form. Who I am is irrelevant. I'm just a little piece of you. But if who I am matters less than what I says matters more.” What is the significance that these characters are trying to say in this book Jimmy Corrigan?
The bit characters in this book are not necessarily saying anything too significant. However, they are showing how they affect the youngest Jimmy. The most significant character that is not shown in the book is his mother. She is constantly covered by a speech bubble, the bottom of the frame, or shown off in the distance talking. While these characters are not significant to show their faces they are still important in the scheme of things. What is the significance of the few characters' faces being shown?
Ware, by drawing the faces of the few main characters, shows that the story is just about these certain characters. While there are other people who might be suffering in the same way as the different Jimmy Corrigans, they are not going to be depicted in this book. Ware is showing that our focus should just be on the characters who actually have their faces shown. While there are other people who are struggling, the focus is not in this story. What is the significance of focusing on these characters?
According to Hayden White, each story is in its own way a narrative. In each story that we hear or read, the author or storyteller chooses what to include in the story. The author always gets to choose what the focus is on. In the movie Requiem for a Dream, there is a strong focus on addiction and drugs. Filmmaker Darren Arronofsky and writer Hubert Selby, Jr. focus on four main characters instead of the literally millions of people who struggle with addictions everyday. Like in Jimmy Corrigan, Requiem for a Dream ends on a rather depressing note, but we are so engrossed in the characters that the authors have chosen that we are upset at the end. The focus on a limited amount of characters allows the audience to feel more attached to these characters making the moral of the story that much more important. I've included the ending to Requiem for a Dream, I would advise watching the whole movie before seeing the ending.
http://www.youtube.com/watch?v=uuzNohk5cYw