I think it’s fair to say that most by now know to take Pro Football Focus’ player number grades with a grain or two of salt. They have their own metrics by which they judge things, and perhaps with the methods that they use to grade, it has some kind of accuracy, but it doesn’t necessarily mean one player with a higher grade is better than one with a lower grade.
Former Pittsburgh Steelers wide receiver Antonio Brown, for example, did not even receive an 80.0 grade for last season, when he led the NFL with 15 touchdowns.