Gushue will likely have to beat Edin to win the World championship. Including the round robin, those teams could meet 3 times. Under the ridiculous Page playoff system (it is truly deserving of ridicule), the Gushue team could beat Edin team two  out of three times ,and still end up in second place. Think of Brad Jacobs going undefeated in the 2016 Brier, and getting 3rd place, or Homan winning only 1 of 3 in the Scotties this year.( against Manitoba)