With the recent success the Miami Dolphins had with their offensive line in 2016, it's easy to forget how inconsistent they were from 2009 to 2015 with their blockers. Despite selecting John Jerry (3rd round, 2010), Jonathan Martin (2nd round, 2012) and Ju'Wuan James (1st round, 2014) in the draft, the Dolphins struggled both on the ground and through the air far too frequently to win games on a consistent basis.
There is a reason why stability, on a team's coaching staff and in the front office, is so important to the success of an NFL franchise. With each regime change comes a different philosophy and offensive/defensive scheme.