Forecasting running back results is an incredibly difficult business. They’re extremely usage dependent, which means that they are subject to the changes in game plan that a team might have either on the season level or at the individual game level. Running backs take a beating, which means that they’re sensitive to injuries. To make matters even more difficult, the NFL is moving steadily towards become a timeshare running back league. All of this is to say that the the usual difficulties that we might have predicting the future become even more pronounced when trying to project running back results.