DT - This could really go either way. Conspicuously absent from the group is a legitimate pass rusher from the inside (and apparently we did want Butler back). However, the run defense should be a lot better here. Some say Wise is that interior pass rusher we need, but do we actually use him that way? I don't know the answer to that.
EDGE - When I go down the list of positions, the only one that really sticks out to me as a major improvement is EDGE. But that's a crazy improvement which should have a real impact on this defense.
ILB - Getting Hightower back has to be considered an improvement even if he isn't at his career peak. I still don't like the depth here, but we might just be giving those snaps to edge players and Dugger (who I think would be most useful at sub ILB at this moment in his career).
CB - Kind of up in the air, but assuming Gilmore and Jackson stay, not much changed. Mills is probably a bit of a downgrade to JMac (who may still return). I still think Williams can be a real player, though, and the only thing keeping me from being more excited about Bryant is his role is locked down by Jones.
S - Our depth was already great, but now it's 1 player deeper with Mills. If Dugger can improve in coverage, he could take over the role Chung held for so long.
Hard to see it not being better. Certainly more well-rounded. I'm expecting some 2018-2019 type production.