why the voynich ist celtic

[Jorge_Stolfi]

None of Toresella's samples look even similar to VMS images

Why do you say that? To me, some of those images would look quite at home in the VMS.  Like the one at the lower left corner of your composite, or the first one within the green line.

My theory is that the Author had the text for the herbal but at most only a sketch of some parts of some of the plants.  Thus he asked the Scribe to make up all the missing plants and parts, and gave him a bunch of those "alchemical" herbals to use as crib.  (By the way it is unfortunate that the name "alchemical" has stuck.  I don't see much connection to alchemy.  "Fantastic herbals" may have been a better name...)

All the best, --stolfi