Cooper Flagg might be the best American-born basketball prospect since LeBron James entered the 2003 NBA Draft. That’s a bold claim to make against the likes of Anthony Davis at Kentucky, Zion Williamson at Duke, Greg Oden at Ohio State, and Derrick Rose at Memphis, but Flagg has put himself in that conversation during an electric freshman year. Flagg has been the best player in college basketball this season despite being one of the youngest…