The night before the final day of Rickey Henderson’s professional baseball career, he concocted a makeshift drink that his team called “Championship Juice.” The moment didn’t come with the Oakland Athletics or with any of the other eight clubs the first-ballot Hall of Famer played for over his 25-year big league career. This was the San Diego Surf Dawgs, an independent league team that Henderson played for in 2005, at 46 years old, in one final…