Whose Big Idea

It's simply become shorthand for anyone, even a fanboy, to believe a director owns a movie. Look at how Capone describes (500) Days Of Summer:

Director [Marc] Webb (working from a script by Scott Neustadter and Michael H. Weber) is wise to let us know early that both sides of this love equation are not perfect people, and when their feelings are hurt or they just grow tired or annoyed with each other, they aren't going to hide it.

So Webb made that decision? Shouldn't the sentence read "Screenwriters Neustadter and Weber (in their script shot by director Marc Webb) are wise to let us know early on both sides of this love equation are not perfect people..."?