>>521581738Garrosh was going to be facing trial, Wrathion and a bronze dragon Kairozdormu help him break free. They go through the Dark Portal in Blasted Lands (it turns from green to red at the start of WoD and immediately the new found Iron Horde start invading because of how time works)
Garrosh kills the bronze dragon Kairozdormu (cannot recall if it was a betrayal or he just was no longer useful) and Wrathion goes off to do his own shit (I dont think hes in WoD, he might have not even entered the portal but IIRC he did help Garrosh escape).
At the end of the expansion in the patch that had the Hellfire Citadel raid, Archimonde from the WoD universe is killed (he is already dead in our universe and Kiljaeden is still alive) the Iron Horde is completely defeated aside from Guldan who was doing his own thing (iirc)
In Legion, Guldan escapes into our reality and does something to become le final boss of the Nighthold. He gets in contact with our reality's Kil Jaeden (who was never actually killed) Guldan from the WoD reality is killed and then the next raid, the Tomb of Sargeras is where we finally kill Kil'Jaeden in our reality with the help of Khadgar and Illidan while fighting atop a ship within the Twisting Nether which is one of the caveats of truly killing demons (iirc)
to answer your questions more directly.
alternative reality draenor is because of Garrosh, Wrathion and the Bronze dragon's Kairozdormu's plan, Garrosh's ultimate plan to create the Iron Horde or a true horde because he was fed up with our realities pathetic excuses.
Garrosh and co are already aware of the Dark Portal from our timeline. so all they did was realign our current one to wind up in alternative reality Draenor. I'm not sure where they landed but they were constructing and mobilizing an army at the launch / intro of WoD
All the other timelines do not matter, although, Chromie and Bronze Dragon fuckery is a constant now.
