Proof isn't always possible

I previously wrote that I was unable to reproduce the lossy Vigenere that I learned from a book by a forgotten German author. I have now been able to recapture the lossy version, and a way to salt the grid, which the German author called a "seed." To build the unsalted grid, write the alphabet across the top without the "Z," so as to build a 25 x 25 grid. To fill the grid, start with "A," and increment through "Y," and begin the next line with a "Z," such that it displaces the line to the right. I chose the message, "THE QUICK RED FOX JUMPS OVER THE LAZY BROWN DOG." Underneath it, I repeated the password: PASSWORD. To encrypt, I chose the row with the plaintext character, and chose the column of the key character, or plainchar DOWN, keychar ACROSS. For a "Z" I merely insert a "Z." This yields the ciphertext:  THE QUICK RED FOX JUMPS OVER PAS SWORD PAS SWO RDPAS SWOR WTO CCGPT YWP NIR IJDLA EBKA THE LAZY BRO