What do you consider McBain and Ehrhoff to be? There's a reason why none of the two have been able to pin down a regular spot in the lineup and Sutter keeps having to mix his pairings up. Perhaps he's trying to protect those guys from being liabilities? That's a big reason why McNabb is paired with Doughty, he's the only one who can cover for his mistakes.
What some of us are saying is that we'd prefer to see guys who should be 3rd pairing guys to not be playing top minutes, which is what the Kings have been forced to do since 2014-15 after the losses of Mitchell, Regehr and Voynov.
Not entirely new. Muzzin and Doughty are familiar with each other. Martinez would likely slot with Byfuglien, and that leaves us with McNabb and Schenn. I figure that in the late stages of a game, Sutter and his staff would rely heavily on those 4 (that is if the team was to add Byfuglien or any other top 4 right-handed dman).
I think for a majority of the game though you'd find Sutter rotating more balanced defense pairings, likely keeping McNabb with Doughty, Muzzin possibly with Byfuglien and Martinez with Schenn (similar to Martinez being paired with Greene in the past).