Every so often it helps to switch your assumptions or give them a little shake up

Like many (most?) people, I assumed the first person who withdrew cooperation was Josie - but what if it was
Shannon. The discrepancies might have been in
her story of the day’s timings. Then, while at the police station, a chat with Josie revealed to her that the police knew certain things and that she, by continuing to cooperate, could give them info that could either get Shannon in trouble or herself or the both of them. Maybe a line of questioning became uncomfortable. So Josie too withdrew cooperation?
I’m not saying that’s what I believe happened, just giving assumptions a shake to create other thoughts
All speculation and MOO.