What changed for Gretzky when he moved between Edmonton and LA? Obviously, his teammates got worse, but that's not what I'm talking about. What was so different about his situation in LA that would cause his ratio to get so much worse in one season?
Did he really miss Kurri that badly, or was it something else?
LA was a unique situation for Gretzky. While the Kings did have some support for Gretzky, he was definitively the center of attention for generating offense. While he still was the top guy in Edmonton, his supporting cast with the Oilers provided much more support and I think they had to rely on Gretzky a little less.
Whereas in LA, Gretzky was depended upon more and the Kings likely traded scoring chances more so than the Oilers did, which is a gamble that sometimes benefited the Kings, or cost them goals. Naturally, while the Kings generated their highest probability of scoring while Gretzky was on the ice, they also were just as likely to surrender a scoring opportunity.
You also have to consider his linemates, which was often changing due to the amount of ice time Gretzky received in LA. Not one of them was considered to be a well-rounded, defensively aware forward as Jari Kurri or Esa Tikkanen were. Now, when Gretzky isn't on the ice, and the scoring opportunities are less likely to occur, wouldn't it be wise for the coaching staff to try to prevent goals from occurring more so if they aren't generating scoring chances?
Also, take a look at the game results from 1988-89 with the Kings. This is a team that surrendered a lot of goals in losses (as well as in wins/ties),
http://www.hockey-reference.com/teams/LAK/1989_games.html
The Kings also did not acquire an established #1 goalie until much later in the season when they traded for Kelly Hrudey in late February of that season. Then you add the fact that he went from a defense that consisted of Kevin Lowe, Steve Smith, Charlie Huddy, Craig Muni, Jeff Beukeboom and Randy Gregg to Steve Duchesne, Tom Laidlaw, Dean Kennedy, Dale DeGray, Tim Watters and Doug Crossman, that is a huge defensive downgrade.
So less puck possession, more scoring chances allowed, worse defense and goaltending and less defensive help, and you are likely to see the number of goals surrendered by Gretzky's team to go up more than before. I mentioned in another post that the Kings were tied for the 5th worst defensive team in the NHL that season, surrendered 335 goals. The team GF/GA difference was +41. In Edmonton the prior season, the Oilers had the 8th best GA, only giving up 288 goals, and had a +75 GF/GA differential.
Rather than focusing on the single player for being the cause of a team surrendering more goals or scoring chances, we have to look at all of the elements involved. How many shots on average did the Kings surrender as opposed to Edmonton? I bet with less puck possession, the Kings surrendered significantly more shots and scoring chances. With a weaker and less physical defense, they also likely did a poorer job defensively in front of the net in recovering rebounds and cleaning up in front.
For many years, the Kings were also considered to be a rather soft team. That is until they brought in Jay Miller and moved McSorley to defense to help add some more physicality on the blueline. They also addressed some much needed depth issues offensively when they dealt Bernie Nicholls to acquire two top six forwards in Tony Granato and Tomas Sandstrom.
What's funny is that Bernie Nicholls was often criticized for being a rather lazy player during his time in LA. It was one of the reasons the Kings ended up trading him, even after setting team records for goals scored. And in the long run, the trade ended up benefiting the Kings more than it harmed them. And Bernie never came close to achieving those numbers after he moved on. Was it the Gretzky factor that helped him achieve his career high numbers? I would say so.