Returning to this after resting my mind over the New Year...
Among several remaining questions, does anyone have any more thoughts on the following clue under the heading "Whatever Next":
"Alpha and Omega, t and e."
The answer will be the third term in this sequence. My thoughts so far are that it may refer to Revelation 22 ("I am the Alpha and Omega, the beginning and the end, the first and the last."), but I can see no further...