With Ronnie Brown out for the rest of the season the Fins need 25-year old RB Lex Hilliard to step up.  Hilliard has played in 11 games for the Dolphins this season and he has carried the ball 9 times for 46 yards (5.1 ypc) and he has also caught 4 passes for 22 yards (5.5 avg).  Hilliard also has 11 tackles mostly on special teams and he will keep those jobs as well as being the #2 RB for the Fins the rest of the year as long as he stays healthy.  Ricky Williams is getting up in age so the Dolphins need Hilliard to step up the rest of the way to help keep him fresh.