Reason #1: They don't buy into conventional wisdom about what is "likely to happen." They create their own reality, by showing up, doing each thing to the best of their ability, and having patience with themselves and the game
Reason #2: They play as a tight team, recognizing each other's strengths and abilities.
Reason #3: They are resolute. When they fail like they did in game 6, they get up and dust themselves off and try their best again.