Marshawn Lynch. He's been banged up an going against the #6 SF rush D. However he is the starter an will see most of the carries. I would be shocked to see Bush get more than 9 carries in this game. Mcfadden is a stud an catches the football well. Bush just wont see enough touches for him to be useful. McFadden also totally destroyed Denver in 2 games vs them last year.