The page with the index column on the left might be in random order.
Often index columns were there only for a visual reference to find a particular line and could be almost anything. In other words, they were like capitula, not meaningful in themselves, but using different shapes was like using different colors for capitula (with a wider palette), it let you scan down faster to the one you wanted.
In many of the calendars and astronomical tables of moons, they would simply use a b c d e f g a b c d e f g a b c d e f g to express the days of the week and as you can see, it's just a sequence, it doesn't correspond to the first letters of the day of the week (e.g., M T W TH F Sa S) or anything meaningful related to the content other than the fact that it repeats every seven lines.
I've been assuming the most likely explanations for the index column are that they are
- the first letter of each "paragraph" or
- a sequence to help the eye find a particular spot which may bear a relation to the text on the right or
- that the characters relate the information on the "index" page to something else in the manuscript (which may or may not have been bound in with the other pages) or
- a random column to help the eye find a particular spot with the characters bearing no relation to the following text or
- it's a ruse to make it look like a sequence (I don't think this is the most likely explanation).
There are certain quirks in the manuscript that seem unlikely to exist if this were a fraud document (unless it's a very OLD fraud document). Since frauds are designed to make money, certain corners are usually cut and certain ideas are unlikely to come into the forger's head. I doubt that a 19th or even a 17th century forger would include things like a complicated labor-intensive rosette map in a style that's not typically western European, or plant drawings in a style that is not characteristic of the time (as with the segment of plant drawings that appear to have been drawn from life or from specimens), or an index page in the middle of the book.