Response to text talk

The first thing that stood out to me is the fact that instead of actually building on to the text, pictures can sometimes take away from it. I always assumed that the pictures would reinforce the story, but according to Beck and McKeown they actually draw the students attention away from the text. This causes students to rely on the pictures for the plot and the students miss a lot of crutial plot information. It was interesting that one of the ways they chose to fix this problem was to show the pictures after reading the book to the students. I have always heard that it is a good idea to show the pictures before reading it to the students as a way of prereading and introducing the main points. So which is the best strategy? Likewise, Beck and McKeown describe background knowledge as something else that gets in the way of students comprehension of the main points of a story. I have always thought the more background knowledge a student has the richer the reading experience would be for them. I feel as though this article contridicts several concepts I have been taught in the education program. Can both ideas be right? I see the truth in both cases but who is right here?