I feel as though so many around here are panicking a bit too much about acquiring another expensive blueliner and aren't seeing the forest from the trees.
Step back and pay attention to some of the hockey being played right now. Notice the bluelines of some of the remaining teams in the playoffs? No? Let's observe...
Penguins blueline: Letang, Daley, Maatta, Dumoulin, Lovejoy, Cole
Lightning blueline: Hedman, Coburn, Garrison, Carle, Sustr, Koekkoek, Witkowski
Stars blueline: Klingberg, Goligoski, Demers, Russell, Oduya, Johns
They're not exactly dripping with a ton of depth on their blueline either.
The Kings don't need Yandle, forget about him. They need a healthy blueline and one more guy who can knock McNabb down to a lesser role. The Kings don't have to waste any resources or tangible assets to add such a player.
Doughty, Muzzin and Martinez is a solid top 3. They are missing someone to round out that top 4. They also need to start giving an opportunity to a Gravel and/or Forbort who could perform just as well as a stiff like McNabb.
Not sure what'll happen to Greene, whether he'll be ready for next season or if he'll be injured long term again, but they need to be more mobile and having two of Greene and McNabb in the lineup is asking for trouble. One is enough. We saw the struggles with three stiffs in McNabb, Schenn and Scuderi.