I don't think that's inconsistent with my point. I just think that there is a symbiosis there that fans frequently don't appreciate. If a back is stopped for a loss, many fans immediately complain that the offensive line didn't do it's job; sometimes, though, the offensive line has done exactly what it's supposed to do, but the back hasn't. The back doesn't take the blame, the big guys do.
I'm a fan of offensive line play and frequently when I watch games, I will watch the big guys do their thing without regard to where the ball is going. I got sort of trained to do that. I'll tell you that some of the most effective offensive lines don't get great backwards push in the running game -- they're effective because they create and sustain gaps that backs can exploit. If the backs don't exploit the holes, the offensive line is deemed ineffective. If the backs exploit the holes, the offensive line is considered to be good or great.