You can talk about Corsi until you're blue in the face, when all it does it lead to good defense and not good offense, you have to assess your personnel. Kings strength WAS their center depth...Thanks to Stoll and Richards it's a weakness now.
Offense from Defense is important for teams that lack lower line offense. Kings didn't get enough. Their D scored 34 goals in 479 man games was average at best. Should have been more like 45 goals and with a skill player like Doughty getting that much ice time, 7 goals is about half of what he should have scored (and lets face it, his 7th goal was a gift, not a goal).
Cap issues kept the Kings from getting some offense at the deadline and getting O from the D was imperative and they didn't get it. Blah Blah Blah Voynov...Martinez injury...yadda yadda yadda...doesn't matter you have to find a way and McBain would have helped the Kings get more from the blue line offensively and he should have been worked in more often.
Bottom line: When the Kings score 3 goals in a game they're 31-3-6 and they've won 16 straight. I think the problem is clear. Score a little more, fewer games go to OT and the Kings win a few more games and make the playoffs.