Between 2014 and 2019, the Pittsburgh Steelers had the most consistent and stable offensive line, including core starters along the interior in Ramon Foster, Maurkice Pouncey, and David DeCastro, who had been together since 2012. Marcus Gilbert as the primary right tackle from 2011 through 2017. Alejandro Villanueva has been affixed to the left side since 2015.
Foster has retired since then. Gilbert was traded last year. Villanueva is in the final year of his contract, and there’s a good chance he won’t be back in the black and gold next year. Pouncey and DeCastro are both over 30, and potentially winding down their careers.