Biggest difference: Luck
LA captured lightning in a bottle on their run to the Cup. Everything went right in the playoffs. Every player got hot at the right time. New Jersey winning two games in a row near the end is the only semblance of adversity they had to face.
LA also had no significant injuries. You don't even hear rumours that anyone on the team is playing through injury.
The new NHL is all about parity. Anyone can beat anyone. LA won two tight 2-1 games in overtime. A lucky bounce the other way in either game and it's very different. Really, the only game the Kings had any back luck was game 4 in the Cup Final. That's it.
The Kings got hot at the right time. That's all there is to it.
You don't go on a 16-4 run with luck. The Kings are the perfect example of a big team that is built for the playoffs, not the regular season. Their big bodies are the reason they werent injured (just like Boston), not luck. You can't injure a guy who's 4 inches taller and 20 pounds bigger than you very easily. Surely unlucky injuries happen, but you can't wear down and injure players unless you're bigger like Chara's effect on the Sedins. The Kings outhit and wore other teams down just like Boston did to their opponents which is why they were the healthy ones - not luck.
Even in those close games, LA didn't just luck-win them. They constantly applied pressure and goaltending was the difference in those matches. Quick made some unbelievable saves that would have lose them the game - Brodeur didn't.
The whole team went to fricking game 7 of the finals. You can't get more experience than that.
Yes you can - you can win the bloody Cup. We have a team of losers right now, not winners and that's the different.
As for the OP - exactly what I've been saying all along. The Kings are big, as was Boston, but its the physical style of game that we need to adopt to be successful. The Canucks have some giants up front like Jensen, Malhotra, Kassian and Bitz but they're either on the bench, in the press box or not being used at all. AV needs to try and use more of these big guys throughout his lineup. The Kings had a giant on each of their lines (Kopitar, Penner, King, Nolan) as did the Devils (Kovalchuk, Zubrus, Ponikarovksy etc.) which is why they got so deep into the playoffs as well, but at the end of the day the Kings were just bigger.
On defence, it's mostly size but also the style they play. The Kings have 2 offensive defencemen (Doughty and Voynov). The Bruins had 2 offensive defencemen in their run (Chara and Kaberle). All the other 4 or 5 defencemen are big, physical shutdown guys who don't gamble, don't take stupid risks or pinches and are great in front of their own net. They're physical and grind down the opponents - not only with big hits but rubbing guys out along the boards really wears them down over a series. Guys like Matt Greene, Willie Mitchell, Seidenberg, McQuaid, Ference and Boychuk are masters at this which is why they have Cup Rings. Meanwhile, the Canucks defence is a pathetic excuse for a D. You clearly can't win in this league during the playoffs with an agile, fragile, nimble offensively minded defence. The Florida Panthers have a very similar defence and they suffered the same fate we did due to the number of defensive breakdowns caused by gambles. It's also a personel issue - our defenders are far too small to play a playoff-like-defensive game. Guys like Tanev, Ballard, Bieksa and Salo are not big enough for the playoffs. Sure Bieksa can play physical, but he isn't big enough to wear down opponents, and not big enough to contend with giant forwards like Lucic and Kopitar who took him to school. Edler is of perfect size and we need more guys who are 6'2" plus, over 210 lbs. They don't need to put up points - just play solid defence. Sadly, 2 of our most physical defencemen in Alberts and Rome aren't being used at all - a guy like Andrew Alberts is exactly what this team needs and I'll take his occasional brainfart over Tanev's complete absence of a physical game in the playoffs.