Because JaMarcus Russel is horrid. The Faders run the ball almost entirely to protect/hide their not-so-good quarterback play.
We should play this game with 8 in the box until Russell can make us back off. Their receiving talent is subpar, so our DB's shouldn't have too much trouble in man coverage. Javon Walker is the biggest threat they have, and he won't be at 100%, after that, the next best OAK receiver is Ronald Curry, nuff said.
Man coverage on all the receivers with safety help over the top on Walker should just about completely neutralize the pass and force the Raiders to be just as, if not more, one-dimensional than they have been.