Tom Brady, likely the GOAT QB, was a 5th round pick. His vertical leap sucks, he had average speed, and he was not a hulking monster. However, he had the “it” factor. Spatial awareness, quick reactions, quick reads, and good arm strength.
Dan Marino was slow by NFL standards and a below average athlete in the NFL, yet he was a top 5 QB all time.
John Elway was a great athlete with lots of speed and power, but he played his best football when he stopped running the ball and concentrated on being a pocket passer.
AR has impressive athleticism but it is the spatial awareness, ability to make quick reads, etc. that make a great NFL QB. The athleticism is icing on the cake.
Brady was also a very good baseball player. He was drafted by the expos. Baseball translates in seems, mahomes, elway, r Wilson, marino, etc