Well they could just do better in the other events? Both made it to legends stage, but only c9 made it to playoff.
Vitality played world final, but did not do well, they also did not qualify for fall final. So they have fucked up more than just going 3-2 and not 3-0 at the major.
c9 is more of a partner team problem, but still they are playing major, esl events and they have not won since Dallas where half the teams did not come..
So they could just have done better and therefore get the better seeds.