Cornerbacks, quarterbacks and offensive tackles in no particular order. Cornerbacks are difficult for several reasons, most notably a lack of clear and available film that features all 22 players on the field. More often than not, the cornerback might not even be on the screen the majority of the time which hinders the ability to see hips, breaks, transition, makeup burst and top end speed to recover. Also, so often, corners at the next level were not corners in high school, at least not fulltime. Many players are projected to make the transition to cornerback which can be a big gamble based on temperament, hips, feet, quickness, speed and sometimes size. Quarterbacks are a big gamble because intangibles can be very, very hard to evaluate. Size is no longer as big a concern as it was in the past. 6-foot is the new 6-foot-2 when it comes to minimum measurable standards. The spread offense has limited the complexity of the passing game, limited the amount of intermediate and downfield throws which can increase questions about arm strength and with most players now predominantly in the shotgun, footwork is nowehere near what it used to be for many prospects. How mentally tough and competitive a prospect is under center is a huge component to success at the position and also extremely difficult to project. Being in the right place at the right time in college at QB is also a huge factor in whether or not a player pans out at quarterback. Offensive tackles can always slide down to guard, but true exclusive tackles are the hardest to project because the feet, flexibility and athleticism required are difficult to assess primarily because they are rarely challenged. They are always the biggest, strongest, baddest guy on the block in high school. Rarely do they face a defensive end over 220 pounds and most often they are less than that. It is easy to overpower those guys. If a guy does not appear to be a natural finisher, this can be very concerning. Does he have a nasty streak? Is he mean? What does he do when he gets his tail whipped? These traits are why the week leading up to the Under Armour All-America game is so vital to the evaluation of offensive lineman because for the first time the offensive tackle is at a distinct disadvantage athletically. When he gets beat up, does he respond or go in the tank? Can he recover the next play, the next drill or the next day?