yes, a worldine requires a somewhat restricted structure, which you are not going to get in level IV, let alone V. Also, the OP never explain what worldlines have to do with agents, or what the advantage of this way of thinking is.
yes, a worldine requires a somewhat restricted structure, which you are not going to get in level IV, let alone V. Also, the OP never explain what worldlines have to do with agents, or what the advantage of this way of thinking is.