The intro quest line that is not avaliable not states:
Anduin Wrynn says: But that dream can never be realized so long as Sylvanas Windrunner leads the Horde.
Anduin Wrynn says: She expects this atrocity to crush our spirits. Shatter our unity. But this I vow…
Anduin Wrynn says: The Alliance will endure… and the Banshee Queen’s insidious reign will be ended.
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So, hard to say what is the logic of the events.
It’s like the Killer Queen quest, where you see the warbringers: Sylvanas, and she orders “burn it”. And the follow up line is:
Lady Sylvanas Windrunner says: When I sent you on this mission, I did not foresee this outcome.
How is this possible to have all of those elements, I have no idea. (Actually the “design by kommittee” approach that the devs use might explain what’s going on to a degree, mentioned in the article in another thread).
gl hf