[rogerpepitone]

Something I've been wondering: (Haven't gotten 2 or 3)

Spoiler for Timing:

When was all this planning done?

For example, a killer might have made a key from a wax impression, but when?
Kinzo, Krauss, Natsuhi, Jessica, Genji, or any of the servants could have done it any time. And unless it's George / Shannon, the servants were loyal to Kinzo or Krauss, and would be unlikely to be an accomplice to an outsider.
If it were Eva, Rudolf, or any other outsider, it would have had to have been a year previous, and IIRC, everybody thought Kinzo had 3 months to live?

If Kinzo isn't a conspirator, when did the killer learn he'd be able to get the ring?

And the "body's too burned to determine male or female" bothers me. If it's intact enough they can tell that he had 6 toes, then the pelvis can't be that badly burned either. The doctor should have been able to think of that at least.

Having a person play dead would be pretty tough; the "slap victim across face" test could put anybody who tried that in a sticky situation. Similar with hiding in a room.