The first one was a low budget independent film, after it was hugely successful the director is famous and producing other movies. He is also working on a new found footage project called "Area 51." The second was probably just who was chosen by the director to do the basically studio mandated sequel. Even though I really liked it, it was basically made because you know...money. I don't know about the change for the third but I'm excited to see what Ariel Schulman and Henry Joost do with it after the excellent Catfish.