I myself was a little surprirsed that this, the second draft edit for the story, left little to do on the 'First time' and 'Gettin Fancy' chapters.
And yes here is where I start filling in back story that will make the Justin Worrell case far more coherent. When I was first turning my story into a full-blown murder mystery originally I felt a little like 'stuffing a 7 pound rooster into a 2 quart jar' as Adam's momma might say, and I am now free to reconceptualize some of the sketchier details into a much more coherent frame.
and I have to say it is a big relief!