When a star running back -- Jamaal Charles -- goes down with a season-ending injury, his backup doesn't exactly fall under the wide-reaching umbrella of the term "sleeper." When that backup has just 14 career touches and is also in the backfield with a long-time breakout candidate, then he's pretty sleeper-y.

Such is the case for Charcandrick West, the player with a dozen career carries, and Knile Davis, who owned a Rushing NEP of -30.05 on 204 carries entering the 2015 season.

That's a -0.15 per-carry clip. Over a large sample.

His career Rushing Success Rate was 30.39% entering the season, which suggests he's a home-run type of player whose home runs aren't enough to result in a net positive.

This year, Davis owns 4 successful carries on 11 attempts (36.36%) and a Rushing NEP of -0.46. West is 6 of 12 (50.00%) with a Rushing NEP of 0.57. Head coach Andy Reid says that West is more like Charles than Davis is. That alone isn't the takeaway, but coupled with Davis' woeful efficiency, it suggests West is the back to own in Kansas City.