Like what MEILNII said "it's still part of the season" CLG performed the best among C9 and IMT better over the full year. Sure they didn't win the Summer Split but they at least got out of the first round something C9 couldn't do in the Spring Split, they also beat that same team that sent C9 home during that time.
Winning over the full season is more of a accomplishment than say a team that only got hot during the second half of the year and still not being able to win.
The LCS is similar to Football or Basketball where the patches are close to say injuries. Say the meta changes from ADC's to TOP lane carries the team that has more focus on ADC are now "injured" because of the Meta.
Which team would you rather have to go to Worlds?
CLG where they PROVED and have EARNED spots at MSI for NA and have shown that they can win against the best teams in the world. They might be in a slump right now but I have faith to believe that they will bounce back and show up again for NA.
IMT where if Reignover doesn't camp for Huni, Huni will just fall off the face of the Earth and not do anything that makes sense. A Mid and Support who don't do anything and a ADC that gets caught out 24/7. It's 2015 TSM worlds all over again if you ask me.