The OP was talking about why directors get billed over screenwriters. It doesn't really matter if the director isn't on the same level of notoriety as Cameron, they will still get most of the credit and attention over the majority of the other crew aside from the people starring in the film. Essentially what I was saying is because people assume that directors have most the involvement in the film, it makes more sense to give them the most credit for it, but there are some who don't do as much as people think they do -- which applies to some high profiled directors as well. I was talking about major feature films distributed under big companies, not indies. That's a whole other ball game.