That's kinda the point. Adrian Peterson will be added to the list and it'll still be a true statement.
Makes one wonder why spend a first round pick on a "feature back". I've been somewhat disinclined to buy into the whole "running backs are a dime a dozen" thing but even back in history some of the best never made a Super Bowl. OJ, Earl Campbell to name a couple. Denver was always able to effectively plug in someone new because they had a real good OLine.