So we don't know if the Horde started to kill spies first or if the spies to kill the Goblins first.
Alright, Sylvanas said there is a battle she longed for and it could mean that she meant "Gather enough Azerite to enforce a peace treaty". Are you seriously beliving that? I mean, you seriously believe that there is the possibility that she wants to force mere "peace treaty" by saying "there is a
battle she longed for". Aaaaalright
Sylvanas has also -repeatedly- shown that she is not the selfless and peacefull person you try to represent her as. She has shown far more often what she is willing to do to reach her goals (torture, kill, rise people from the dead, and so on).
I don't think anyone is trying to jump to a mischaracterization of sylvanas, she did a pretty good job showing what her true nature is.
Also implying that Anduins expression had any kind of power hungry look in it is laughable at best if not even sad how far biased you are to twist stuff like that. He looks obviously worried/engaged.