Writing Non Fiction - Foreshadowing the Inevitable

i'm a discovery writer and er plotters and and planners. I find i only really know the ending once i get to the ending. And then it's a case of actually going back and adding in a few lines, not to make it obvious, but to foreshadow the inevitable. Making it seem like an inevitable who did it, or or ending, but you can put in that later. Many people who are just starting out writing don't realize that you don't have to write in order. You can add in a red herring lateror you can add in some foreshadowing laterad - absolutely le sir.