I do agree with good prospects getting drafted behind good starters (Maroney behind Dillon, LJ behind Priest, etc,) but Addai is way too young to spend an early round pick on a RB when other positions are needed.
All first round RB examples (a sizable example considering how many RBs get drafted in the first round)

euce was not old when they drafted Bush.Ricky was not old when they drafted Deuce.Henry was not old when they drafted McGahee.Foster was not old when they drafted DeAngelo.TJones was not old when they drafted Benson.Rudi was not old when they drafted Perry.Dunn was not old when they drafted Duckett.The list does not include Alexander, LJohnson, or Maroney.Maybe some of the examples were of guys that weren't as good. All it takes is a team to decide they like the player at the draft position they sit in, regardless of who they have as a starter at that moment in time.One cannot expect the top RBs will go to a team with a dire need at RB. It doesn't always work that way.One can always hope though.