I don’t know the answer to that and never will I try to figure it out. These coaches get paid well in the 6 figures to evaluate talent. Let them do their job. They better know what intangibles to look for. I played running back and linebacker in highschool and was drafted as a cornerback. It’s not that difficult especially if they gone pay me 6 figures. I will tell you what to look for 1. Speed 2. Quick feet, change of direction, hip flexibility, ball skills, discipline, heart, and confidence. Now how hard was that? You can run a kid through drills and pretty much identify every trait I just mentioned, with the exception of confidence and heart. So difficult to evaluate? No I don’t think so. They better do some dam coaching, and stop listening to this star **** in these magazines and online sites.