14 traits required of an NFL quarterback; and most comments being posted here are going ga-ga over the one trait which the combine measures - arm talent.
These 14 traits are:
Footwork
Fluidity
Throwing Mechanics
Arm Talent
Quick Release
Reading a Defense
Mental Processing
Accuracy in a Clean Pocket
Accuracy From Different Platforms
Eye Manipulation
Poise In Pocket
Clutch Factor
Decision Making
Work Ethic
Of these 14, Young is elite in at least 10 of these. Three I don't have an opinion on. The only one I can say with certainty that Young falls a little short of is arm talent. And arm talent is actually broken down into three components: strength, accuracy and touch. Young has accuracy and touch. He lacks elite strength, although he does have an NFL arm and can make all the throws. Footwork, Fluidity and Mechanics are the three that I don't have an opinion on.
Young is an elite talent, maybe generational, the only concern being his size.
The reason Young is maintaining his status as the #1 QB, despite not throwing at the combine, are all these intangibles which make up an elite QB and which Young is clearly exceptionally gifted with.