my uneducated opinion is that the scheme we run has caused us to pick a certain lineman and maybe then handcuff how to coach those linemen.
Maybe it is time to get away from athletic, outside zone and RPO linemen, and get some big road graders and run more gap and inside stuff.
I also think it is tougher to find truly “athletic” linemen, and easier to find big bruisers. Cody Ford is a perfect example— was supposed to be one of the most athletic linemen in his class. And he clearly is not.