Much like the understanding that the NFL has become a passing league, it has also has adopted the "running back by committee" model. In a day and age where running backs seem to be a dime a dozen, teams are less likely to commit to one guy and therefore take on the RBBC approach to the season. With the mindset of having multiple backs sharing the touches, many also assume that each team needs a "speed back" and a "power back". The idea, of course, being that the power back gets the tough yards and wears down the defense while the speed back plays the finesse role and provides the home run threat to the offense. The last few years the Raiders have had the luxury of a backfield that consisted of Darren McFadden and Michael Bush. In some ways, it seemed to be the perfect combination power and speed that would be a nightmare for any defense. Except when you break down the games when both running backs were healthy last year, you saw more of McFadden wearing do...