Richards and Gabby for me, but I think it correlates a lot with not having capable players who can chip in every now and then in the bottom 6.
Let me elaborate: Let's look at some of the Eastern Conferences D-pairings, example Montreal: Subban, Markov, Gorges, Emelin, Diaz, one of Weber/Bouillion/Beaulieu; Boston: Chara, Seidenberg, Hamilton, Boychuk, Ference, McQuaid; Pens: Letang, Orpik, Martin, Despres, Niskanen/ Engelland/Murray; Jets: Bogo, Buff, Enstrom, Stuart, Clitsome/Hainsey/Postma; Leafs: Phaneuf, Gunnarson, Franson, Liles, 2 of Fraser/Holzer/Kostka/Gardiner.
The point is, if you can only rely on 2 lines to score, the opposition can match up much more easily. Nash and Stepan on the ice? MTL will counter with Gorges and Emelin, PIT with Martin and Orpik, BOS with Chara or Seidenberg. You get the idea.
However, IMO, the drop-off in quality from the 2nd to the 3rd pairing is significantly bigger than from the 1st pairing to the 2nd: Subban-Gorges provide a similar level as Markov-Emelin defensively. Boullion/Diaz/Weber/Beaulieu do not. Same for PIT and WPG, not as bad for the Bruins, worse for TOR IMO.
If you have 3 lines able to score, at some point, the opposition will have to send out their 3rd pairing. That's crucial. Otherwise you play them 10-12 minutes against a piss poor bottom 6.
I know there are teams that have 3 solid pairings, and none that stands out, but I think that's the exception. In the EC, f ex, I can only think of the Devils. I'm not including poor defensive teams a la BUF, PHI or TB here. They're not the standard we should be playing to.
To bring a bit of positivity into this place, I think MZA could really help getting our 3d line going. If he doesn't do it by himself, he at at least gives us the possibility that a competent player can be put in the bottom 6. Kreider-Miller-Callahan is not a bad 3rd line, for example.
LGR. Time to start a push for the playoffs.