Outlier stats will revert to the norm
In sports, a common adage when trying to predict future stats for a player or a team is to trust that more often than not, the stats will return to the mean.
The general thinking behind this is that if a player has an anomaly in a season (either for good or bad) the next season they are likely to return closer to what they have done in the entirety of their career. Expecting this to happen in 2020 would put Aaron Rodgers above Kirk Cousins.
There is a statistical measurement for calculating the all-around effectiveness of a quarterback and that can be taken by looking at their quarterback rating. Last year, Cousins was significantly better than Rodgers posting a 107.4 compared to a 95.4 respectively.
This might lead some to believe that Cousins will again be better than Rodgers in 2020, but expecting both players to return to the norm gives a different story. Throughout their careers, Cousins is averaging a 96.8, and Rodgers is at 102.4. Returning to average puts Rodgers ahead of Cousins for 2020.
