RandV
It's a wolf v2.0
Look around the league at the teams with successful bluelines. You can rarely trade for top-four d-men because everybody is in the market for them and it's going to cost you prime picks/prospects. You can hope to sign one as a UFA, but chances are they're just at the start of their career decline, and you're going to dramatically overpay.
So basically you have to draft and develop them. And other than Hughes, Benning hasn't drafted or developed a single one. And until he does, having talents like Petterson, Horvat or Boeser up-front, isn't going to make a world of difference when it comes to making the playoffs, or doing anything once you get there.
That's not really true. Maybe if you need one right now, but enough players shift around that if you expand your search window by a year or two you should be able to get someone. The fundamental problem here is Benning has had 6 years, and basically his attempts have been Sbisa, Gudbranson, Juolevi, and now Myers. This isn't a 'well what can you do?' situation, it's a fundamental failure. Given the time Benning has had and the assets he's spent on the above mentioned players some results should have been delivered by now.