The Arizona Diamondbacks were supposed to be around .500 last year. PECOTA had them at 79-83, but finishing last in the NL with a 5.11 ERA and 13th in OPS at .692 was the recipe for the Diamondbacks’ horrible record. Injuries, especially to the pitching staff, can be blamed for some of their struggles. They had only three pitchers start more than 15 games last year in Madison Bumgarner, Zac Gallen, and Merrill Kelly and used 16 starters total during the season. The hitting suffered as well. Ketel Marte played in just 90 games, Carson Kelly never got back on track after returning from a six-wee…