Running back Jerick McKinnon went down before the season began. Tailback Tevin Coleman was out after Week 1. It didn’t matter for head coach Kyle Shanahan’s offense as the 49ers possess the fourth-best rushing attack in the NFL, behind the Ravens, Vikings, and Cowboys.
The difference between those teams and San Francisco? The Vikings and Cowboys employ elite, highly-drafted running backs and the Ravens’ quarterback is a dual-threat player. San Francisco has been able to gain 175 yards per game on the ground with undrafted free agents running every snap.