New Post: "I Do Listen to the Experts. Do YOU?"

[ReneZ]

And I also think that Voynich would be quite capable of removing from the VMS any evidence that could weaken or contradict his claim.  Such as any stamp, signature, or marginal note that would indicate that the book could not ever have been in Rudolf's possession.

An interesting question.
The cover that the MS had, when Marci sent it to Kircher, might have had some indications from earlier ownership, but the Jesuits replaced this cover. I guess we are still lucky that Tepenec wrote his name on the first folio instead of this cover.
Voynich was forced to remove all indications related to the Jesuits from the books he obtained from them, in particular small sheets of paper with bibliographical descriptions, made when these manuscripts were in a Jesuit library.
He kept several of these, which have also been very helpful in tracing this collection.
We don't know if the Voynich MS had one, and, if so, what it said, but given that these were written by a capable bibliographer (whose name we can only guess), it would not have mentioned Bacon, and that would have been bad news for Voynich. 

He certainly exaggerated in all aspects of his books, in order to increase their value. It is hard to say whether he himself believed his exaggerations or not. The Roger Bacon origin is a perfect example of that.