"So what about LF
DRAENEIS?"
Seems hard to grasp. What about Highmountain Taurens you could ask? Gonna answer this: Draeneis joining Draenei makes sense no? Dont need any asspull to connect the dots. Highmountain Taurens joining Taurens, makes sense, no? Connect the fucking dots!
Night Elves joining only one set of Night Elves because someone were sceptical? Thats something else entirely. Whenever people bring this up they seem to ignore the HM Taurens for some reasons.
Army of the Light got NO Horde-race npc visible on Argus(I have not seen any). But alot of Draenei, together with the two ultra-alliance characters Turalyon and Alleria.
Nightborne is as much as random as Void Elves, and it's there you need to connect the reasons for NB going Horde.