So, let us look at the law.
In TbC, Illidan is just a bad guy and there is no attempt to explain things from his prescription.
Now in Legion so far, we know that he was actually working to defeat the burning lesion.
So with the lore of Illidan being good or not as bad as we thought in TbC, did Blizzard have the Legion expansion lined up even before Vanilla and were just waiting to reveal more of the plot.
pretty interesting i agree, what do you think?