Originally Posted by iamgine
If there's no rainmaker then Joe would've disappeared to the future.
But the only time there is no rainmaker was once Joe "closed the loop." If he doesn't close the loop, then the cycle is going to repeat itself again. Even then, it is still possible that Cid can become the Rainmaker.
Also, it was just a theory of Joe's that he would go back to the future (teehee). Nothing else in the movie indicated that he would definitely go back to the future.