Alabama running back Trent Richardson is clearly one of the top talents in the 2012 NFL Draft and is also one of the best prospects at the running back spot in years. His name is mentioned along with the likes of Adrian Peterson, Darren McFadden and Reggie Bush as a can't-miss draft pick.
So why isn't he considered a lock as a top-five pick next April?
Part of the reason has to do with the teams that will be drafting in the top five, but some of the reason is that teams are afraid that the shelf life of running backs is too short on which to use a top-five pick.
Let's take a look at all the running backs drafted in the top 20 since 2002 to see whether or not taking a running back that high is too much of a risk.