Mattison was a solid complement to Dalvin Cook in the Minnesota backfield after being a third-round draft pick in 2019, but it's possible that might be Mattison's effective ceiling. Power and burst allow him to hit holes hard, and improved play last season from the interior of Minnesota's offensive line gave the rookie room to run. Mattison didn't add much as a receiver (aside from a strong Week 13 showing against Seattle), but he did show decent hands in college and could be reasonably effective if he were used more often as an outlet option for Kirk Cousins. What Mattison doesn't have is speed or elusiveness to consistently get away from tacklers once he breaks through to the second level, and three of his four longest runs of the year came in the fourth quarter of games where the Vikings held multi-score leads. For a player brought in to provide insurance in case Cook got hurt again, it was also discouraging that Mattison was sidelined at the same time as Cook the final two weeks, opening the door for Mike Boone to make a splash. Cook's summer holdout put all eyes on Mattison, but Cook ended up reporting for the start of training camp.