Why Voynichese doesn't have cribs?

[Bernd]

The 'crib attack' as you say relies on a framework of conditions that must be met in order to be viable. I am sure there's more but here are a few.:

• 'Voynichese' encodes text
  
• 'Voynichese' encodes text in a way that at least somewhat preserves its original structure
  
• 'Voynichese' encodes meaningful text in a way that at least somewhat preserves its original structure
  
• The text is connected to the imagery
  
• The text is connected to the imagery in a similar way a known or expected plaintext would be.
  
•  The author copied the imagery from a source understanding its original meaning
  
• The author copied the imagery from a source understanding and preserving its original meaning

So far, we have no proof, not even reasonable certainty, of any of the statements above. But considering all attempts of finding cribs have ended in nothing so far, we should consider the possibility that at least some of those statements might not be true. My doubts continue to grow.