Getty Pittsburgh Steelers defensive lineman Derrick Harmon earned a strong rookie grade from Bleacher Report after Week 4. First-round rookie defensive lineman Derrick Harmon missed the first two weeks of the 2025 NFL season for the Pittsburgh Steelers . Yet, in a small sample, he was still one of the more impressive rookies in September. That’s what Bleacher Report’s Brad Gagnon argued Wednesday. Gagnon gave Harmon an A-minus grade through Week 4. Only five first-round rookies received a grade