I've been reading this thread for about an hour now and I think the thought of time traveling back to Grom's era with Garrosh going back as well is a great idea. (My Crazy Speculation) It could involve Garrosh going back to the past and seeking his father to warn him of the burning legion. We as the heroes follow Garrosh through the timeway to bring him to justice for SoO. Grom ignores his son's pleas and sees the power that is fel magic and drinks the fel demon blood as he did originally. We must join forces with Garrosh to crush Grom and the burning legion. Garrosh lands the final blow on his father and he picks up his father's Gorehowl and wrecks the Mannoroth and his forces thus keeping the timeline in tact and giving Garrosh a nice redemption story. We all know Metzen loves those types of redemption stories.