The Indianapolis Colts shocked the NFL world by bringing back 44-year-old quarterback Philip Rivers to potentially lead the offense through the final four games. Maybe Riley Leonard starts, but that doesn't seem overly logical with the return of Rivers. Rivers' return begged a question asked by many, though: How many other retired greats could return?
One could even be New England Patriots legend Rob Gronkowski. He is still just 36 years old, just five months older than Kansas City Chiefs tight end Travis Kelce, and probably could still add some value to a team. Heck, just imagine him paired with Indy TE Tyler Warren.