I'd like to stress -
The intricacies of how brackets progress down to the final grand finals match is very intricate, and those who got 8th place should be very proud. It doesn't mean they 'couldn't' win. It means they didn't win, and they gotta try harder next time to make their victory more assured. That is how tournaments work. It's an inherently flawed structure, but one that accepts the fact that each tournaments isn't the "Be All End All."
Tournament results, at least within the top 100, aren't in order of character 'viability' or 'effectiveness'. Which we all know,
but sometimes our brains fool us into thinking we've got some sort of new 'scientific research' to pick apart and apply too much value to. Players can lose a set for a number of different reasons, many independent of their character choice. Just because a players using X character didn't break top 50, doesn't mean that character CANNOT break top 50.
Diddy won, but that doesn't mean Olimar or Greninja or DK can't win the next big tournament. It's all up to the players and how far they can push their characters. But what I want to stress is that it's not always ALL about the characters these players choose, but how they personally play against their opponents.
Always catch yourself if you find your mind attaching too much value to placements, and stop yourself from drawing hasty conclusions on anything just from one data source.
We've got insight into new characters that are tournament viable. It's the same as a few weeks ago when Luigi started placing. It's exciting! But nothing is defined yet.
Look at melee - Yoshi in top 8. Embrace the chaos.