I said long before ever knowing the Name Xenophon that that "Sorry, No Cipher, Sorry, No Cipher" Message written in the form of an X has to be some sort of cryptic clue or message itself because it's a 'Double Cross', the Double Cross is the claim that after an Apology, He claims there is no cryptic clue or Message with this Card when, in fact, this very message is likely the clue itself.
Now that I know of Xenophon, who's name was regularly shortened to 'XEN', it could very well be A 'X' on the ENvelope = X EN to form the Name XEN, and that this is the Cryptic message where the writer truly is does "Clue you in".
Now this is all pure speculation and opinion obviously but it's speculation and opinion I can show several pointers for in order to offer it as at least potentially credible.
The message on the card itself. .
"I feel it in my bones, you ache to know my name, and so I'll clue you in."
The clue is in the Sorry, No Cipher written in the shape of an X on the inside of the ENvelope. X E N, is the 'Cipher' clue He apologizes about, it is the place where He clues us in on who He Is. He tells Us on the cards message "I feel it it My bones, You ache to know MY NAME, and so, Ill clue you in...." Many then think they need open the card for the 'Big Reveal' but that is not where the reveal of the name is hidden. It's Hidden in the X message of the ENvelope, that is where We'll find He clues us in!
1. "Sorry No Cipher, Sorry No Cipher" is not written on the Card itself, but rather, the inside of the letters envelope. Now some may argue this is of no significance but I would counter that, actually, it is because He's never done this before nor since the reception of this one single communication. He could, and I see no reason why He wouldn't do there was a reason not to do so, wrote this on the actual card itself as He wrote much else on it.
2. Zodiac makes a point, for some reason, to point out or make a claim that 'Sorry, No Cipher' which for me has always led me to suspect that there is one in this card and/or letter itself, we just have to find it. Now this apology would be insignificant to point out as anything meaningful if, up to this point, Zodiac had either, A) Sent a cipher with every single letter and/or card he'd ever sent this far and thus justifying an apology for His breaking His own 'Status Quo' or...
B) Every other letter in which He does not include a cipher He writes an apology for not including one.
Case and Point, as simple example: He wrote numerous times post The Stine Murder and Initial Letter where He includes a swatch of shirt, even later enclosing a piece in a later communication. But the letter's in-between, He never once said "Sorry, No Blood Soaked Piece of Victom's Shirt" because He know's He isn't expected, nor has He said, He will always enclose a piece with every letter thereafter.
Then there's the little FACT of little Significance that this Man, Xenophon Lusby Anthony, is THE ONE AND THE ONLY MAN, ever Named by A Witness at the scene of an undisputed Zodiac Homicide as the "Possible Subject (responsible) in this Matter." The first piece of actual, not circumstantial, but actual evidence in the form of a positive Identification made by a witness that said Xen Anthony is the man who Murdered Paul Stine the Cab Driver. No Other Identifications, no other solid evidence found or put forward to link any suspect to the Zodiac Crimes exists, with this being the sole exception and if that is not enough to make Xen Suspect No. 1, at least until evidence is shown to significantly rule Him out, then I don't know what more could be.
It's been shown time and time again in cold cases that go cold even for decades that within the original investigative files, the offenders name, or evidence linking Him to the crime at least, was there all along with Green River Killer Gary Rigeway as prime suspect, prime example. He passed a Lie Detector when originally questioned and had a (false) alibi. But His DNA sat in a storage evidence room for over a decade after DNA became possible to test. It took a dogged Investigator in Dave Reichert to be promoted to Sheriff to solve it. His first, very first thing He did as newly elected Sheriff, was announce the reopening of the Green River case and later gave His reasons why as: "I went to that river time and time again to pull young girl after young girl out of it dead. That Had such an impact on Me, I swore I would never forget them and when I was in a position to be able to do it, I ordered that investigation be reopened." When Dave was told of the DNA from three victims being from the same man, and that that Man was in the DNA database and they got a Hit, He cut the Forensic Lab Lady off mid sentence on the phone to say: "It's Gary Rigeway, isn't it?" The reply was "Yes, Did you already know?" "No" Dave replied, "I've always just felt it was Him."
Why won't SFPD agree to test the Partial DNA Sample they lifted from a Z letter when an outside agency offers to pay, such as a TV Show. They are offering the Dpt. the chance to potentially solve a long running cold case at no expense to their own budget, a budget in difficult financial times where Forensic Testing of evidence is selected sparingly in each case.