The ability to overcome injury is the hallmark of every NFL QB.
Kelly - knee, back and shoulder injuries.
Montana - back injury
Manning - neck injury
Brady - ACL injury
Brees - shoulder / elbow injury
Big Ben - elbow injury surgery
Elway - no left ACL blown out in the 70s in high school, torn biceps 1997
Young - concussions
Aikman - concussions
Favre - Iron Man & pain killers to play through countless injuries, drug abuse, alcohol abuse
Rodgers - broken collarbone / clavicle
Mahomes - dislocated kneecap 2019
Watson - ACL 2017
Allen - overcame a right elbow injury which could have derailed his entire career if it was more severe. Thankfully Allen is a tough competitive player.