This is my recipe for quarterback success in order of importance
1a. Accuracy. When you decide where to throw it, that is where it goes. Simply put inaccurate quarterbacks are ******* useless and frustrating as ****. See Malik Rosier.
1b. Decision making. Ability to read a defense, adjust a playcall. Know where you want to go with it before the ball is ever snapped and know where you are going to go with it if the defensive alignment shifts and eliminates the likelihood your first, second, or third option will be open. If Jarren wins the QB battle it will be because he develops this trait. Elite decision making at the college level is a tremendous weapon for a QB/OC.
If you do not have these two abilities you will not be a great QB. Accuracy can be quantified, decision making is less tangible and difficult to assess in younger players. Sometimes a kid has a light bulb moment and everything just falls into place.
3. Composure/Leadership. Not getting rattled and keeping the team focused even when **** appears to be going south. This is true for offense and defense. Faith in your QB lends confidence to the defense even in a game that is getting away from you. Trust is a factor in this "ability" and it often takes time for that trust to build within a team. The QB has to prove to everyone he is a gamer and can be counted on to make the plays and calls to snatch victory form the jaws of defeat. Not easy to accomplish in college due to lack of opportunities to show it.
4. Arm Strength. a trait necessary to be an elite qb in the NFL. Helps to expand the field and create more space in the defense to make plays. Helps to fit balls into tighter windows. Not a requisite for success in the College game IMO.
5. Great feet, Pocket awareness, or a great Oline. This trait or stroke of luck translates into time. Time to make throws or see the field. It is only lowest on the list because a great o line can mask this deficiency.