Elephant in the Room Solution Considerations

[Jorge_Stolfi]

the scribes were given the task of transferring to vellum a complete draft [by a deceased author]

That is indeed a possibility.  

However, after spending many hours looking at the text and transcribing it, I believe that the original Scribe(s) knew the Voynichese alphabet (unlike some later owners who tried to "restore" faded text).  That makes it more likely (but of course not certain) that the Author taught them and had them train until their handwriting was acceptable to him.

There are also hints that the VMS was put to vellum in installments, over a period of many years, and the "spelling" (or encoding) may have changed in between.  See the "Language A"/"Language B" shift.  That too suggests that the "vellification" of the VMS happened while the Author was still alive.  

But of course nothing of this is certain.

All the best, --stolfi