The Raiders have cut running backs Adimchinobe Echemandu and Louis Rankin despite both having huge preseasons.  Echemandu carried the ball 9 times for 107 yards (11.9 ypc) for the Raiders in the preseason.  Undrafted rookie RB Louis Rankin was a star for the Raiders in the preseason with 21 carries for 148 yards (7.0 ypc).  The fact that the Raiders could cut these guys tells you what they think of the three RBs that they kept.