Did he go neutral because of his ideals and hatred of the goddess (who is enabling the war)? Hibiki was right when she said not joining a side was prolonging the war, but it doesn't mean he has to join either of the sides. He could make one with a purpose the suited his, either by plainly enforcing peace (lol) to the land or preventing them from doing any more war as long as he is present. He is too much of a pussy if he really does not take a side.