So, can you prove that he did change anything? Is there a source for that?
The comic doesn’t show Garrosh doing anything, and Blackhand does exactly the same thing but here he gets infused with fire from the elements.
Also you completely ignored the source I provided showing that Blizzard intentionally decided to change drastically Blackhand away from similar visual of AU.
We can continue discussing even more differences, like the fact that there isn’t Maraad in AU Draenor, nor there was Main universe Yrel, and those beings existed before Garrosh arrived in AU Dranor.
As much as I dislike retcons, especially those that do not add anything or make the story better, I still take them as canon because, well, they are canon by the storyteller (Blizzard).
Fan fiction would be to think otherwise lol.
I think there is a better explanation for Dawn of the Infinite dungeon.
Those events were bound to happen and were part of the canonical timeline.
Which is why Eternus was never able to save her sister, so ultimately Nozdormu makes Eternus understand that they cannot change the past.
Garrosh interfered with that universe, but ultimately everything played according to its intended timeline.
You want me to blow your mind?
Kairoz knew that they couldn’t simply travel to the past and change the past, because even if they succeeded by doing so, it would prevent Garrosh from even being born, thus breaking continuity.
So Kairoz instead found another universe alternative that he could do what he wanted, because the time ways and the story was different there.
Of course blizzard will never talk about this ever again because of the mess it did.