They lost against denial as well, before winning.
Please, don't be a fanboy. I can go and find "good results" for every team, but the bad results are still there.
Elevate and denial are tier 5 teams, so yes, 16x8 and 16x9 are close results, the game could have gone either way if some stuff didn't happen;
The match against C9 was on mirage, which is definetly Kabum's best map. But obviously, teams will ban the map against Kabum. And I can quote you the latest results on other maps against real top tier 1 teams:
16-4 on cache
16-0 on overpass
Again, don't be a fanboy.