@lukehero: At first I thought the same thing with Iris helping, but no one on the Flash team has powers yet. So I don't see why Iris can't be in the action. She knows self defense and she can find information with her journalism skills. This could give her character more story if she is in the action.
@wolfrazer: I feel the word main character and main protagonist mean two different things. The main protagonist in my eyes is one character. Even if the other main characters get a lot of screen time the story always revolves around the main protagonist.