DRG underperforming is understandable, FPX showing off their progress was amazing, but EDG was just disappointing.
Here's how to fix these teams:
DRG - More international experience
FPX - Make minor adjustments (mainly regarding defense + reading intelligent players)
EDG - Do something about the leading, whether it be After or Haodong. If they can find an IGL that can call well and frag well then it would be amazing because while Haodong usually has good calling (assuming After's weird strats and tactics affected him this tournament), his aim/mechanics isn't nearly good enough to help EDG be as good as they can be. Chichoo and Nobody are good for their roles but I think you could consider finding better replacements. The issue with getting rid of any one of the team members is that I'm afraid it'll mess with the chemistry and teamwork. As I see it After is the main issue because he's trying to do things that firstly aren't working, secondly isn't working, and thirdly probably will never work.
There's the fix.