Marlon Mack Backup: Who can replace Marlon Mack as he is ruled out for season with torn Achilles?

Marlon Mack suffered a torn Achilles in the Colts’ loss to the Jaguars this Sunday. What will happen to the Colts going forward? Colts’ fans have something else to worry about other than the 27-20 loss from Jacksonville. Marlon Mack,…