Bare with me here:
Considering that this is a class where the intertwining of concepts is celebrated, then maybe it is what can lead us to our closure from an abrupt ending. Given, the one sentence “Z is for Zulus” can be quite abrupt, maybe it is an ending after all.
Maybe the letter is supposed to mean “end”, much like people put “the end” or “fin” at the end of a movie. Maybe it could mean that everything literally ended for all of human-kind. Maybe it’s just a play on words due to the symbol “Z” to signify the end of the alphabet, and must therefore signify an abrupt ending also. When you get to “Z” at the end of the alphabet, it’s not as if it is a soft letter to end on. Maybe it’s Maybe Everett’s entire reason for enumerating chapters with the alphabet was for the sole purpose of getting to “z”. Maybe it just happened to work out that way, and with no previous ambition at all. Maybe it’s to draw usage to a letter that is so sparsely used. Maybe we’ll never know, and maybe that’s what makes this book so contemplative…