I think some of it, if not a large portion of it is also on the field leadership. Who is the leader on defense. Yea I don't know either. We've always had vocal leaders (enforcers) on defense at tOSU. As of late, it's like watching a group of kindergartners trying to figure out which crayons to use. Also our linebacking crew has been a one man show with Shazier. One man cannot however do the job alone. Nor do I honestly believe that RDS is a natural born leader. He's good at his position but I don't see him in the faces of the other guys on the team firing them up to follow his lead. Not to mention (and please forgive me) he doesn't seem like he's the brightest guy on the planet. He does what he's assigned to do, no more..no less.
Imagine the defense as a spoked wheel. Let's say the old wooden type. Now imagine that same wheel where the spokes are all very strong and capable and the hub at the center is cracked or even missing at times. The spokes are worthless and cannot do their job when the hub isn't fully effective. The linebackers are that hub. They are the core of our defense. Do their job and no one has to worry about making up for their mistakes and therefore having to do too much.
But hey that's just one man's take. We all have our theories and opinions.