Just watched former LW Coach Agape's stream about overwatch world cup for a bit of time, and his additional comment was inetresting:

"I don't understand why people believe South Korea will have an easy win this world cup. Team France has a much better chance of winning the whole thing, because they are sending a whole team that is already top-tier in communication and team play. Team France is basically a team that's been around for 7 months now, and every pro game for them is a scrim for the world cup. South Korea, in comparison will have almost no practice compared to Rogue because South Korea is a mix of different players. The reason South Korean pro teams are so good is because of their team play and communication that has been building up for a long time. Team South Korea doesn't have that this year. Unless SK practice super hard they will not beat France."

Yeah the reason Lunatic Hai is so good is because of the long time they've been spending together as a team - they know what to do even without a lot of communication. Teams need time with unchanging rosters to get used to each other and LH is the best example - they've been around for almost a year now. team South Korea will not have that, and their synergy will certainly be lacking compared to Rogue at Blizzcon.