In July 2019, Diamondbacks general manager Mike Hazen made the most fascinating trade of his tenure when he dealt highly-touted shortstop prospect Jazz Chisholm to the Miami Marlins in exchange for right-handed pitcher Zac Gallen. Most fans had the same reaction: Zac who? Gallen’s anonymity didn’t last long. Just over a year after the D-backs acquired him, Gallen broke the…