Only four teams have been more productive on the ground this season than the San Francisco 49ers. They use an old-school approach to rushing by using a fullback often. In fact, FB Bruce Miller has been on the field for nearly two-thirds of their offensive snaps this season. That makes the fact that he is expected to miss the remainder of the season with a fractured scapula potentially very damaging to the Niners offense. Miller ranks fourth in blocking among fullbacks by Pro Football Focus, so he won't be easily replaced.