We can't ground and pound without a dominant offensive line OR an elite back. I don't think you need both.
Good line + elite back, that works.
Good back + dominant line, that works too.
Good back + good line, you're going to struggle to get 20 points in some games.
Average back + good line
Average line + good back
Average line + average back, or anything worse...
will fail every time. You need a few 40+ yard TDs each year in order to score more than 22 or 23 points per game. It's really hard to do that on the ground.