You left out the part where he isn't paid nearly what any of the players you listed are. He isn't Hughes (who signed that 7.9m contract at 22), or Hedman, or Werenski (who makes 2 sheets more per year) and never was projected to be. He is a guy that eats 21mins a night and gives you .5ppg with average defense. It's insane to me that people have watched this guy since he was a kid, and think he is magically going to morph into something he isn't. His contract isn't even bad at this point.
At the end of the day, he has as many goals than the rest of our D combined. He is the only guy that can walk the line on the power play with any control (I see him knock down clears all the time on the PP), his first pass out of the Dzone is typically good-great, and he bleeds blue and sticks up for his teammates. He sucks at clearing the front of the net, and he is prone (this year especially) to loosing his assignment in the Dzone. If he was amazing at those things guess what, he would be getting 9+mil.
He has been paired with mostly AHL level defenceman his entire career (or over the hill vets) and that doesn't seem to be changing anytime soon. Stop complaining about one of the few people on this team that actually shows up in the playoffs.