IDK if anyone has talked about it, but here's my thoughts on that the last of the prophecy is based on unused text

the last pane of glass that we see before the last one is destroyed says "TO SAVE THE WORLDS,
THERE IS ONLY ONE WAY." there is unused alternate version text that seems to very clearly point out what the next rhyme is. "FOR TO SAVE THE WORLDS,
WE LAST OF ALL SAY*".* Whatever is gonna happen, it's seemingly gonna happen at the festival. "Last of all say", "festival day".