Question: must start rb week 4?
Answer: Marlon Mack. Indianapolis Colts · RB. vs. Las Vegas Raiders. ...  Kerryon Johnson. Detroit Lions · RB. vs. Kansas City Chiefs. ...  Chris Carson. Seattle Seahawks · RB. vs. Arizona Cardinals. ...  David Montgomery. Chicago Bears · RB. vs. Minnesota Vikings. ...  Duke Johnson. Houston Texans · RB. vs. ...  Frank Gore. Buffalo Bills · RB. vs.