Ok, I haven't posted at all in either of the two related threads. At first, I just had nothing to contribute. Soon, I was so fascinated, I could only watch in amazement.
And when I thought I might know something... I decided I definitely needed to keep quiet, lest I accidentally slip.
But I wanted to thank you, Paul!
For one of the most amusing and involving mysteries I have read in quite some time. And just like all my favorite mysteries... it started off by convincing me the real culprit was definitely not the one... and provided just enough clues for me to figure it out shortly before the denouement. Bravo!