Originally Posted by
banestalker
no. because he does it above all for his own interests. Illidan is not the sort of person who does anything for "the greater good" but rather does the good deed because it is in his own personal interest.
Granting Illidan holy powers and let him be the champion of light, that indicates the person has a selfless personality and a morality bordering on the side of good and Illidan is not like that.
All they had to do was to let him devise a plan to take care of the legion using their own weapons (fel magic) against them. That's what being a demon hunter is about, they're not demon hunters anymore if they don't use the power of fel.
Of all the characters in the lore, (Paladins, Priests, etc.) they had to choose the one person who has absolutely NOTHING to do with holy magic. I don't even know what to say anymore.