Wait... So why aren't Nightborne and High Mountain Cows not for both sides?

[Kaznarok-feathermoon (Kaznarok)]

@Marshen-bleeding-hollow

Void Elves fighting Blood Elves (who worship the Light) makes a lot more sense, as they are opposite energies, just personified.

while being buddy buddy with the Lightforged Draenei who they themselves are Light personified.