Honestly, part of the run D problem was AD freelancing early in the season for sacks and TFL without having a LB cover his gap.
AD is gonna be a beast, no doubt. That said, he doesn’t win every time and getting doubled 70% is twice as much as anyone else in the league and nearly six times as much as the typical #1 DL.
To defeat all those doubles, he almost had to freelance. That said, in order to prevent getting gashed, he needs a tackling machine behind him to cover his gap.
When he and Suh stayed in their gap, they shut high powered run teams down completely.
I think the combo of Kiser, Littleton and sometimes Matthews inside with the exterior pressure of Fowler, Ebukam, sometimes Matthews, OBO (don’t sleep on that kid) will make it harder for teams to double AD and will provide the necessary support for AD to freelance and for us to be stout in run D.