So now that the year is over we can take a look at this.
Here's how Tua changed from 2020 to 2021 in terms of major measures of quarterback play. These are league percentiles. So for example with regard to EPA per play he was at the 45.6th percentile in the league in 2021, meaning that 54.4% of the league's QBs had higher EPA per play than he did in 2021.
EPA = nflfastR expected points added per play (efficiency)
CPOE = nflfastR completion % over expected (accuracy)
DVOA = F.O. defense-adjusted value over average (efficiency)
DYAR = F.O. defense-adjusted yards above replacement (gross production)
PFF = individual PFF offense grade
QBR = ESPN total QBR; measure of win probability added per play
Sack% = sack rate (sacks/total dropbacks)
AirYds = Air yards per attempt
CP = nflfastR completion probability based on situation & air yards
PFF Recv = team PFF receiving grade
PFF Pblk = team PFF pass block grade
PA/G = team points allowed per game