[The Athletic] Keith Law’s farm system rankings for all 30 MLB teams - 4. Arizona Diamondbacks. The Diamondbacks traded two major-league stars for a total of seven prospects, but those deals have little to do with their ranking here, with two already graduated and only one of the other five in the team’s top 10. It’s about everything else: very productive drafts, goosed by some extra picks and a little good fortune (e.g., the No. 4 player on my 2019 board, Corbin Carroll, getting to them at pick 16), and some strong early returns on international classes, including a payoff on an early, aggressive effort in the Bahamas.