Aside from Jason Myers and his Super Bowl record five made field goals, the Seattle Seahawks' offense was carried on the back of Kenneth Walker III for the first three quarters of the game. He ran for 135 yards, but racked up a total of 161 yards of total offense if you include his two receptions.
Walker was, in a word, exceptional, and the Seahawks needed every single yard he gave them. In the end, Walker was awarded the Super Bowl MVP, and there's not much to argue against it. He became the first running back since Terrell Davis 28 years ago with the Denver Broncos to win Super Bowl MVP.