Seeing all the confusion over the whole timeline/storyline explanation. I decided it might just be easier for me to illustrate Blizzard's insane plotline in a graphic rather than explain it using words alone... because words alone cannot untangle all this convoluted mess.
Hope this explains it a bit better for folks. No... DON'T ask me how this works. This is Blizz Story logic... not mine. I'm just explaining what they're setting up here....
Got it? Good! ^_^