I am not sure. I don't know any copy editor who has left. People go to other desks or to other newspapers or media outlets. Unnecessary deadline pressure and stress. Smart copy editors who know how to edit, are creative, and know a lot about what goes on in the world.
Weaknesses are undue pressure and very clunky system.
I think it would be the executive managing editor. I am not positively sure. I think Managing Editor-Administration. 10 - 15 years. 5 years and up.