While running back depth is never a bad thing, perhaps the Vikings were simply keeping Murray off the trading block while they saw what second-round pick Dalvin Cook blossomed into (or could just be waiting for Murray to make up for time lost to an ankle injury this offseason). Two games into Minnesota's young season, Cook has turned out to be as complete a running back as we've seen in the NFL. While his receiving skills still need refining, Cook has 191 yards on 34 carries so far. He's on pace -- and seems perfectly able -- to carry the ball nearly 275 times this season.