I think his ability to survive, traverse and fight behind enemy lines would be a great asset in a battle royal scenario. He could set up ambushes and I think he has the training to use many types of weapons. He would be my pick because he is so knowledgeable and well trained. He is a direct descendent of the mountain man Jim Bridger, and second LT in the army special forces. But Beatrix kiddo would probably win, she did kill that whole gang of ninjas, but maybe in the woods with random weapons Aldo could make some cool traps or something like that?