It all makes perfect sense that DP would stage the scene to make it look like this happened at breakfast time. To me, it proves that Stacy really did tell Schori what he testified to. That also makes the pristine receipts look like exactly what it was. His alibi folder in case he ever needed it. DP probably knew Kathleen's family would not take things at face value, IMO, and he could not be sure the coroner would rule accidental death.
I am with the State. DP probably did murder Kathleen just before 3am, Stacy did see what she told Schori she saw and wanted someone she could trust to know as well. This shows Stacy did have a conscience and it was bothering her. Plus, she knew DP could get rid of her in a heartbeat if she did not tow the line he had cast.
We know so much that the jury does not know but I still do not think DP will be acquitted. If not a guilty verdict, it will be a hung jury, IMO. That is in spite of what the defense does or does not show in their case.