Rb dilemma created today for championship advice

So I picked up Boone and have held mattison all year. Championship week and cook finally gets hurt. Should I leave mostert in or roll the dice for the win Monday with Boone? Team is as follows : Lamar, Chris Carson, davante Adams, Amari Cooper, Travis kelce, Cooper kupp, Ravens d, Robbie Gould. Thanks guys and good luck this weekend