In McD's scheme, the DTs are the first line of defense against the run. The MLB assists and needs to maintain his gap assignment, but Edmund's primary responsibility is covering the middle. This D is built to stop the pass, which is why it is important to have big DTs, not sub 300 lb DTs, to stop the run. That said, Edmunds will not move outside...he will stay at MLB as that is how the defense is designed. McD will have to change the fundamental design for Edmunds to move; I highly doubt he modifies the D scheme. IMO, the best we can expect is for personnel changes like we just saw - Taylor in, Peko out.
McD is slow to make changes as demonstrated by sticking with Star.