The Pittsburgh Steelers played most of the 2020 season with seven defensive linemen on their 53-man roster, once Henry Mondeaux was called up from the practice squad after five games (aside from a brief stint on the Reserve/Injured List For Chris Wormley).
With the way the offseason has gone, there is no reason to think that the Steelers won’t continue to carry seven defensive linemen, or at least will want to. And while Mondeaux almost surely will be on the outside looking in this time, the fact that second-year Carlos Davis has been playing on special teams coverage throughout the preseason gives us a strong indication of this possibility.