Gandalf and Saruman scene

Should PJ include the scene where Gandalf is captured by Saruman? As you know, in the actual book, the story is just told by Gandalf, never actually covered "as it's happening" in the text. But in the animated version, the scene is used. Since this is a film, visuals are better than stories that can be used in books, but I think that using that scene and cutting into Frodo's flight wouldn't be good. The audience wouldn't have the suspense about Gandalf. Of course, most people will know the plot already, but it still makes little sense. I think that the scene can be used, but if it is used as Gandalf tells it so the audience finds out when Frodo does.