To kill time in the weeks leading up to Ravens training camp, Matt Vensel will rank the top 12 players at each position for the 2012 season. Today, it is running backs. Just 15 backs topped the 1,000-yard mark in 2011. Only 25 had more rushing yards than Carolina quarterback Cam Newton -- and only one had more rushing touchdowns. But elite backs are still valuable, especially ones who thrive in the passing game.