On the character of Wilfrid Voynich

[Koen G]

Or we could say he was a man of his word as far as book deals went.
It depends which way you hope to push it

This was exactly what I was thinking. He was involved in the rare book trade ca. 1900. Which standard should we compare him to exactly to judge his moral character? What kind of insane idealized picture is required to have someone in his position not take the deal? The fact that he as a businessman went forward with this deal and upheld his part of the bargain has no relevance whatsoever to the likelihood that he would knowingly falsify his own stock with DIY projects. If anything, his deal with the Jesuits shows that he wanted to take some risks to obtain real old books to sell.

And even if he sold one, two or a hundred manuscripts that turned out to be (apparently convincing enough) fakes by someone else, that still does not teach us anything about whether or not he would forge a manuscript himself. 

All we see is him buying genuine wares [or ones he is made to believe to be genuine] and selling those.