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.