The Arizona Diamondbacks have stumbled to a 3-9 record in their last 12 games, dropping their overall season record to 16-17. The main culprit has been been the starting rotation. They are a combined 1-7 with a 10.10 ERA while posting just 49 innings, or just 4.1 per start . The bullpen, meanwhile, has a 5.17 ERA in 54 innings during this stretch. But 17 of the 31 earned runs allowed have been from mop-up men Andrew Hoffmann (9) and Brandon Pfaadt (8). For the full season, year-to-date, that has left the D-backs in 29th place overall with a 5.16 ERA, including an MLB-worst 5.42 from the rotation and a 24th-ranked bullpen, which sports a 4.83 ERA. Apr 19, 2026; Phoenix, Arizona, USA; Arizona Diamondbacks pitcher Ryne Nelson in the first inning against the Toronto Blue Jays at Chase Field. Mandatory Credit: Mark J. Rebilas-Imagn Images | Mark J. Rebilas-Imagn Images The question now facing the team is whether or not they can be expected to improve from here.…