As the Pittsburgh Steelers navigate a delicate quarterback puzzle behind starter Aaron Rodgers, head coach Mike McCarthy faces a classic 53-man roster crunch. Carrying four quarterbacks: Rodgers, veteran Mason Rudolph, second-year passer Will Howard, and third-round rookie Drew Allar, is virtually unheard of in modern NFL roster construction. However, an intricate roster loophole involving Rudolph's status as a "vested veteran" could offer Pittsburgh an ideal strategic compromise to keep everyone. Under NFL practice squad regulations, teams can elevate a veteran player up to three times per season without signing them to the active 53-man list. This article originally appeared on Steelers Wire: How a roster loophole could solve Steelers' four-QB dilemma