Currier might have been right about how the VM was put together, but he was wrong about the languages and about some assumptions he made about Eva DAIN and AM having the same meaning.
I would not concern myself so much about different scribes, since copying one's works was the only way to duplicate them. Judged by the illustrations, the VM displays thematical unity that would hardly be possible if created by different authors, unless they were the monks in the same monastery. If the frequency of certain glyphs in the VM pages would be enough to assume a different author, then You are not allowed to view links.
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Login to view. would be written by yet another author. It contains 24 glyph designated by Eva as M, which are relatively rare in the rest of the text. The explanation is simple: the highly inflective language with many grammatical forms could look like a different language. I had examined many medieval writings and I didn't see one page where letter M would be as seldom used, which made me believe that Eva M was a ligature - a minim 'i' + Eva 'l'. This is a Slavic verbal ending for a 3. person, singualar. For the letter M, I designated Eva IIN, which can also stand for other Latin letters - IW, IIV (JIV), WI.
The Voynich words DY and EDY also cannot support the theory of different languages, nor different authors: A writer or a poet can use different styles: for prayers and meditations, he can choose to write in a first person, or in a form of a dialogue - 1.st. per and 2. person, present tense; if he wants to tell a story, he would use 3rd person. If he gives instructions, he would most likely use imperative mood, like in the recipes.
In some languages, all these styles would require different endings. However, this does not mean that the same letters cannot stand for different grammatical styles, or at the end of the words that do not change with grammar.
To me, Currier was not helpful, but the Eva alphabet, although imperfect, was very helpful, because it pointed me where to search for the comparative manuscripts.
You can find more detailed information on VM grammar on my blog