Think about it. The alliance lose, obviously. Cairne is a geezer who couldn't even defend his bovanthropists from the equantropists, so he dies (but is cool with it because now he can walk around and be a cool as the White Tauren). The troll loser just sucks balls. So it is realy between Lady Sylvanis and Warchief Thrall. Logically speaking, Grom Hellscream, while a poor leader and nearly a traitor, was twice the warrior Thrall will ever be. He stalemated Mannagroth (sp?) and redeemed himself with his own blood. Mannagroth (sp?) is less powerful than the dreadlords. Lady Sylvanis subjugated Varimathras, who is himself a Dreadlord. Can you see where I am going with this? Of course, it would have to take place during the day or that Whisperwind lady would just stand around looking cool in shadowmeld, wait untill our Lady finished off Thrall, and then get some crits and cheapshots untill it came down to a close battle.
As a side note, our Lady is a Banshee and is thus able to posess whomsoever she chooses. So she could easily posess Thrall, kill everybody else, run him through, and then waltz right back to here elven body and laugh at them all.