There was some good, some impressive but still some ugly Thursday night in the 49ers’ 36-24 win over the Seattle Seahawks, according to their PFF grades. On offense, San Francisco’s star power shined brightly, with momentum-changing plays by George Kittle, Deebo Samuel and Brock Purdy. Rookie running back Isaac Guerendo also contributed when starter Jordan Mason left the game with a shoulder injury, gaining 99 yards on 10 carries, including a 76-yard run that essentially sealed the Seahawks’ fate.