Stop pulling headcanon that Drust are Vrykuls and were inbreeding with Kul Tiran.
While its not flat out stated that Drust are Vrykul but all evidence points to such, they use Vrykul rigs, they have Vrykul skeletons, their tombs use the Stromheim tomb models, their ruins are covered is norse knotwork designs, their contrusts, golems and altars have the exact same runes from Stormheim and Odyn's throne room.
They are either an off-shoot Vrykul tribe or a different off-shoot of Vrykul descendants. There is just too much evidence pointing to such.
Now whether they inter-bred with Kul Tirans to give them such a larger body type is 100% pure speculation. Its plausible speculation, considering how overly large they are than the 'normal' human bodies and such but again just speculation.
An Ogre is a different species, Kul Tirans aren't, but I doubt Ogre fans have issues with Kul Tirans, I like them, but I think they could be some kind of new customization with humans since they are the same race, still I'm fine with them as a new race, I might actually play a human now(if I ever come back), these guys have way more personality in their design than the baseline ones.
The Kul Tiran rig and a modified model without the belly is being used for Rexxar, and most likely other Mok'nathal. Half-Ogres are a very very plausible allied race because of this.
That's why it's so new compared to the other allied races: they are making it to be used twice, which makes more sense than one super special model.
I dont know why people cant disagree with someone without being rude or insulting folks/putting folks down