Do you look at 4 colors more as a complex combination, or a stark lack of the missing one?
Looking at the community flairs, the mods seemed to have taken route 2. Nothing wrong with this, and it's an interesting or easy way to do it. Lacking white is chaos. Lacking black is altruism. Easy peasy.
(I should note I'm unfamiliar with in-game/lore groups with these definitions like Glint or Ink)
But are there individuals or groups that are notably defined by 4 groups and just nothing notable with the last color?