Gotta run so this will be quick.
The confusion over where Fuddy was found would allow a private autopsy to be started before anybody in the public knew that she did NOT die from drowning.
Somebody should look to see when we first found out about Yamamoto holding her hand in the water as she was floating safely with her life jacket. Was that before, or after, the autopsy was started?
There were two seperate rescue teams. If the fire department team was second on the scene, she might already have been lifted from the water and was no longer to be seen.