@Midelan
yes illidan is a "chaotic good" (cant remember where its from)
everything he has done has been to defeat the legion, weither it looks good or evil, enslavement or ruining part of outland, even to "joining" the legion, all to learn how it works, see its weaknesses and find a way through them,even to stab them in the back like the war of the ancients, and as we learn in ilidan, he was so close... so so close so kaelthas framed him, so we would take him out, saving the legion from him pulling a pull out attack
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yes... but that was oh idk... 10 thousand years later? so im pretty sure that could be unforseen for anyone, and that was again the sunwell, not illidans doing
where does the chronical say illidan was purly evil and did everything just to become super powerful?