You realize you helped the High Elf argument right?
Review of your points:
1) Normal Kul'Tirans exist
2) They're part of the Alliance
3) Can only play as fat Kul'Tirans
4) Due to regular Humans already being playable
Let's compare these points to High Elves
1) Normal High Elves exist
2) They're part of the Alliance
3) Can only play as the Void ones
4) Due to Normal High Elves already being playable (FALSE)
Oh wait, the last point isn't true regarding the High Elves on Alliance. Therefore they become a valid option for request.