I would say that Miami is truly only a few pieces away, but that is also somewhat contingent upon talent on the offensive line developing. From my experience watching football for a few decades, you usually only need one or two really very good lineman in order for the rest of the line to suddenly come together (gel) and act as a cohesive unit. Having that one really good lineman immediately makes the guys next to him look proficient. Similarly, you can't have a hole in the wall because that defeats the wall -- you can't have someone so terrible at the lineman position that they are constantly being blown up -- we've had this in the past even while the rest of the line was decent.
The few pieces Miami needs: a top QB, very good to elite HB, one more very good WR.
That's it. That is literally it. If Miami acquired Rodgers, Wilson, or similar, added a really good running back, and another good receiver I would predict playoffs for them. Maybe even a Superbowl push. What else does a team with a solid defense need? A good coach, yes, and a good front office. If we got those three pieces, though, then I would say we have a good front office...
And because I know we won't get those things, probably, I would say we don't have a very good front office. Seems so incredibly obvious.