It was not fixed that Shawn would win the reward challenge. Each contest had a potential relative or friend waiting for them . This was taken from the cbs website:How did Sean's father come to arrive on Pulau Tiga? Split-second timing, mostly. A significant other representing each of the castaways waited in Los Angeles, ready to board a flight to Borneo if their loved-one triumphed in the reward challenge. The moment Sean won, word was passed to Los Angeles for Sean's father to board the flight. As he jetted across the Pacific to see his son, the other six significant others flew back to their respective homes