I have played most sports at a competitive level and would consider myself a mediocre player in comparison to elite players. One such sport was racket ball. I had the misfortune of ending up on the court with two seemingly advance players in a 3 man "cut-throat" game.
The court had a balcony and there sat a white haired older gent in perhaps his late 60's. He asked if he could join our group so that we could play doubles and he would play with the weakest player to even the competition. He suggested me and thus we played.
I don't know who the old gent was but we won the first game 20-2. The second game was closer 20-13 and the last game was 20-18. The strategy was to keep the ball AWAY from the old man (who turned every shot into a kill shot) and make me beat them.
The point of this introduction, in addition to being highly skilled the old man ANTICIPATED every shot and was always in position for the KILL SHOT!
Looking at running times at the combine and trying to make judgements on tens of a second times without weighing football knowledge, instincts and production at competitive levels is frought with miscalculations about pro potential.