McMillan is just nasty against the run; his ACL is a full two seasons behind him; he should at least continue his play at this level.
Something that is definitely worth considering is the number of Dolphins who are coming off a 2019 season that ended or had time on the IR.
Jakeem Grant, X, Preston Williams, Van Ginkel, Isidora, Ballage, Jennings. (I'm not certain Isidora or Ballage are on the final 53, but still.)
In addition to the slew of FA signings and draft picks, the Fins get all those back, plus a seemingly (finally) fully healthy Albert Wilson.