[split] Did the VM go straight from cerebellum to vellum?

[Jorge_Stolfi]

If there had been countless VM-style documents

I did not mean "countless", but the Author probably had half a dozen or more notebooks, drafts, appendices in the same script.  Or even another book or two like the VMS.  Its would be strange if they did survive.  The survival of the VMS was a fluke.

they would have been mentioned somewhere. Even if the originals did not survive, some comment about them in other literature would - as with many works of antiquity now lost. We can therefore safely deduct that VM-style documents were never common or part of public knowledge.

The "comments about other books" we read in ancient books usually were about other important books that readers would know or care about.   In that I agree with you: I am confident that very few people, besides the Author, could read Voynichese.  Perhaps no one.  

All the best, --stolfi