Implications of the continuity of Currier "languages"

[MarcoP]

It is not difficult to come up with a possible explanation for this. In fact, one can up with many different possible explanations, both based on a meaningful text or on a meaningless text.
The difficulty is deciding which one is the right one.

This seems to be our perpetual condition

Just some examples:
- two people started on a common agreement and both drifted in a different direction. (This can work both for meaningful and meaningless texts)

Why two people instead of one? Is this based on the hypothetical different hands?

- there is a system behind the words that allows for some degree of freedom

I am lost here. The evidence we are discussing seems to me strongly suggestive of "some freedom" in how the underlying language was written. Still I don't understand how this explains the continuous mutation of language through the manuscript.

- the words are some form of enumeration system and the structure of 'higher numbers' looks like a different language / dialect.

If I understand correctly, this idea implies that the apparent "drift" is an artefact induced by the cipher system? 
Like: as I write, I build a dictionary in which I map different words (in the order in which they appear) to numbers.

Code:

the quick brown fox jumps over the lazy dog  1   2     3     4   5     6    1   7    8

Numbers are replaced to the original words: they are represented in such a way that (say) numbers below 10,000 are Currier A words and numbers above are Currier B. Is this more or less what you mean?