Bentley absolutely was a starter, but the larger point is still true I guess.
Someone said they thought the LBs were the source of problems on this defense. I'm not so sure. I think it's the line, with Clayborn and Shelton embarrassing themselves on a weekly basis. The only knock on the LBs I have from yesterday, which might not even be their fault, is how often Burton was wide open in the middle of the field. Even then, I think you want a safety in coverage instead of a linebacker.
I don't think any level of the defense is playing particularly well, but if I had to rank them, I'd say secondary > linebackers > line.