BALLER MOVE: Add in 12+ Team LeaguesROSTERED IN: 55% of LeaguesANALYSIS: Mattisons rostership percentage has dropped below the 60% threshold, as some fantasy managers have opted to remove him during the Vikings bye week. This presents an outstanding opportunity to secure him particularly if you are depending onDalvin Cookas the foundation back for your team.The ongoing rationale for securing Mattison remains intact after he demonstrated his ability to function as Minnesotas workhorse back if ...