The Book Switch Theory

[asteckley]

I believe Koen did a study of art history and fashion history regarding the sleeves of the clothing in the illustrations in the Voynich Manuscript.  You may want to add that information to the carbon-dating information.  The window of

I take your point. But the intent of the diagram is "provenance" specifically -- who owned it and where it's been.  Not evidence for or against possible origin theories.
A different --much larger-- diagram regarding such general evidence around VMS origins is in progress.

(Also, while I think Koen's clothing study is very good, it is also very subjective -- relative to such things as a letter-in-hand, or a C-14 dating report, for example.) 

... even yellow is too much credit for the claim that "the VMS was purchased by Rudolf"

This is true, but it would be a slippery slope to start showing more than the two levels of evidence strength. I included the Rudolf connection because, despite being hearsay, has become part of the putative provenance story.

Here is an updated diagram: