Technically, Lucas could still add vader dialogue saying that he built 3PO as long as he and JE Jones are alive. Since Vader's mask covers his mouth, he doesn't need to worry about matching up lypsinching with his favorite tool.
Technically, Lucas could still add vader dialogue saying that he built 3PO as long as he and JE Jones are alive. Since Vader's mask covers his mouth, he doesn't need to worry about matching up lypsinching with his favorite tool.