Proposed Manuscript Chronology

[Rafal]

We know that the reason for "dialect" differences isn't different subjects (as defined by different illustrations) nor different scribes.

Do we?

From VoynichArchive search engine:

Tell me how Currier A and Currier B are related to supposed different scribes

Prescott Currier identified two distinct statistical patterns in the Voynich Manuscript's text, which he termed Language A and Language B, and also discerned two primary scribal hands, Scribe 1 and Scribe 2, in the botanical section of the manuscript. He noted a direct correlation between Language A and Scribe 1, and Language B and Scribe 2. [url=https://voynicharchive.com/#citation-t0-2][/url]Currier's work suggested that these differences in text statistics corresponded to variations in handwriting, implying the involvement of at least two authors.For example, Currier A rarely features the bigram /ed/, while Currier B uses it frequently. While Currier initially focused on two hands, he believed there could be as many as eight scribes involved. More recent analysis by Lisa Fagin Davis has identified five distinct scribal hands, with Scribe 1 primarily writing in Language A, and Scribes 2, 3, 4, and 5 writing in Language B

I realise it is more subtle but if I understand it correctly it is the main, strongest effect and the rest are nuances and refinements.