What if the prophecy ends at Chapter 6?

I have a feeling that the "Final Tragedy" will occur at the end of Chapter 6 rather than Chapter 7. The only real evidence I have to support this is Gerson saying the Lord of the Hammer (which is based on the prophecy) ended on the sixth chapter. We know that Deltarune will have seven chapters, which leads me to believe that Chapter 7 will take place after the prophecy has already come to pass. Narratively, I think this would be a very interesting way to do the final chapter, as even somebody like Ralsei won't know what's going to happen. It might even be a way for the game to have multiple endings. The message we've been getting beaten into us the that there is only one ending, but what if it was the prophecy that only had one ending and not Deltarune itself? Hell Chapter 7 could be spent trying to undo the damage of the prophecy, to what degree of success though, who knows.