It is really hard to predict qb success in the NFL but the process is becoming more accurate. Height, arm strength, durability, and toughness all matter, but the most important trait is the time and accuracy of decisions. The successful rookies all make the right decisions in the shortest amount of time, and then back it up with goo arm strength and accuracy...another overlooked feature is footwork...Tom Brady will be in the hall o' fame because of his decision making, and his footwork, all of his other measurables are mediocre. Tanner lee has really bad feet, and poor decision making..not a good mix for an NFL future...but a qb from Tulane, who thrown 40 pick 6s isn't expected to be much, so if he make 250 k on the practice squad for 3 years it is a victory.