AD is clearly declining

Quote
Rams43
Aaron Donald doesn't claim No. 1 spot on PFF's top 101 players of 2019

Donald led the NFL with 20 tackles for loss, 80 pressures and topped all defensive tackles with 12.5 sacks – a number that’s down from his record-setting 20.5 in 2018. However, that’s partly due to the fact that he gets double-teamed on nearly every play, thanks to his ability to completely wreck an opposing game plan.