Is it possible that Genn Greymane frames Sylvanas into her being the murderer of Varian Wrynn for revenge for the murder of his son? What if GENN is the person who KILLS Varian Wrynn? Just think about it. Its logical and would be something -NO ONE- would expect especially coming from the Alliance. With tricking Anduin, he'd have the entire Alliance at the Horde's throat again. He'd also be one of the first newest Alliance villains. He'd also have a chance at reclaiming Gilneas since he is the Alliance's military leader. This is also perfect for making Sylvanas and the Forsaken look like they're the innocent ones this time and ending the typical "Horde bad guys" storylines.