As I've posted several times, the offensive line is perfectly within the normal range.
The problem has always been the quarterback. If we continue to pretend that variance among a group of 5 lower paid lesser athletes is our morgue, as opposed to variance at one position that happens to be light years the most important position on the field, then we'll go nowhere and deserve it.
When the college game changed so dramatically the argument was that fewer pro quarterbacks would be available. It is exactly the opposite. More viable quarterbacks are available, with an interesting blend of pro style and athletic quarterbacks. Every year you can evaluate among the two varieties. Clemson had the athletic type in DeShaun Watson and now a more traditional pro type quarterback -- but with some movement skills -- in Trevor Lawrence. Other pro teams are learning to evaluate the two styles, and are taking risks. Many of those risks will connect.
If the Dolphins stand pat we'll be continually stuck and gradually realize that almost every team on the college and pro level complains about its offensive line. That position has declined in athletic ability while others have improved. Those guys have a tremendously varied responsibility in blocking for both run and pass. It is complicated teamwork involving switching off and recognizing blitz tendencies, etc. Often your help is from guys who don't actually help, like O'Leary and Drake.
Cleanse the quarterback position and it will be remarkable how everything rises alongside. We'll be in disbelief we ever wasted so many seasons with Ryan Tannehill.