No. 21 on the Steelers carries a rich legacy. The 2025 wearer is Chuck Clark, a veteran safety who joined Pittsburgh after time with Baltimore and the Jets, providing steady depth behind Juan Thornhill and DeShon Elliott with potential starter value if called upon. The countdown traces the jersey through five Steelers to wear 21 in recent years (Clark 2025–present, Darius Rush 2023–2024, C.J. Henderson 2024, Tre Norwood 2021–2022, Sean Davis 2018–2020), and crowns Chuck Cherundolo as the franchise’s best No. 21—a Pennsylvania native who earned two Pro Bowls and a Second Team All-Pro in the 1940s and was enshrined on the Steelers Legends Team. The Jets game at MetLife Stadium provides the stage where this jersey’s story keeps growing, and fantasy managers should watch how Pittsburgh deploys 21 in base vs. nickel and how depth at safety could produce streaming opportunities in weeks 1–4.