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This one's easy.
Yes, you can blame the strength of Denver's ground game on their lack of a passing game (31st in the NFL in passing yards), but no matter where you allot the credit, it's hard to deny that this is a vicious rushing attack.
Tim Tebow's heady play and powerful style have given an NFL team the chance to do something not many have—run the option.
Willis McGahee has been rejuvenated as a starting back, spearheading the ground game in Denver along with Tebow and a couple of castoffs in Lance Ball and Jeremiah Johnson.
The Broncos were dealt a blow when Knowshon Moreno was lost for the season, but since Tebow's taken over, they've risen to tops in the NFL with over 155 rushing yards per game, after managing just over 100 with Kyle Orton under center.
As long as the defense continues to smother opponents, Denver should be in position to rely on their ground game and literally run out the clock on the other AFC West squads.