With the way the game is going, I'm not sure that a team truly needs a balanced pair anymore. Nashville got away with Subban, Josi, and Ellis in their top 4 with just Ekhlom as the defensive anchor, and they did just fine. At some point, the pressure the possession places on another team by having that many top defenseman outweighs the need for the typical and traditional balance team got out of pairs. So I'm not worried about Dahlin, Power, and Byram.
I don't really think Samuelsson should be in the top 4 with the game he's being asked to play. I'd much rather see him in a defensive pair with Clifton and just asked to start in the defensive zone and play against top lines. When a defender covers for his partner, his responsibilities are so much greater than just being a partner in a shutdown pair. Lots of 2 on 1s, lots of movement required. Gone are the days when a guy like Hal Gill could just stay in the slot and cover. The stay back defender has to be more like a Pysyk or Tallinder, where they've got some physicality but are much more adept at stopping plays with skating, positioning, and an active stick.
I'd rather see Ryan Johnson in the top 4 as the stay back defender, and then have Samuelsson and Clifton do the heavy defensive lifting. And if I'm truly getting what I'd like, Clifton would move on and Adams would get a player like Fabbro. That's allow Ruff to form a shutdown pair with Samuelsson and Fabbro. Or, if he wanted to shift in the playoffs, balance it between shutdown and movement defender.
And I'm always down for 8 defenders on the roster. My 2006 playoffs scar tissue is real. Bryson and Gilbert are basically spares for a movement and shutdown defender.