For me, Warner/1999 at #1 is an easy one. After that, you can debate all you want.
…but I have a few words re AD99/2018.
I recently watched the complete Rams/Chiefs game. Wow!
At one point it was mentioned AD was leading the league in sacks despite being double teamed 74% of the time!
He finished with a league leading 20.5 sacks and 25 TFL—nearly 3 plays per game made behind the LOS.
When you factor in holding calls, you can conservatively say Donald was, on anverage, impacting the game behind the LOS at least 4 times EVERY GAME!
Let that sink in.
In that chiefs game alone, there was at least one holding call and 2 strip sacks that resulted in a defensive score and another score when the offense converted it to points.
How do you know when Donald is in decline? He becomes mortal and starts struggling against DOUBLE TEAMS.
That’s a pretty high bar.
I don’t know exactly where his 2018 season should be ranked, but it deserves a place in the top 10.