Started outlining and even when I had three or four outlines in hand, each one rising from the one before, I was nervous about writing the earlier stories.
And now I reach the capstone, where all the stuff that went before resolved, and unlike every prior story, I am making notes about how to revise the prior outlines to support the action of this. Many notes. Our heroine's magic, and the villain's magic, and what the army can do. . . .
Not to mention that the magic the villain was using to hinder her had not been his own (for reasons). For the final story, it has to be. (And I set up an in-story reason for that.) Which means I have to brainstorm at least three ways for him to use it against her and her group.
And remember to call the bureaucrats clerks because this is not in the fields we know, and such details matter.
Well, it does simplify revision.
And one can think deep philosophical thoughts about why it is a cycle when it ends up in so different a place.