Relations among pattern studies?

[Koen G]

Indeed, the uniformity of these patterns throughout the text weakens the hypothesis of multiple scribes.

If anything I'd say it strengthens the hypothesis of a coordinated workshop environment or something similar. Despite the many differences (dialects? continuum?), the core of Voynichese is still a system which supposes some degree of coordination or at least imitation between scribes. 

This would be like saying that two different handwritings in a legal document are by the same scribe because they use similar elongated ascenders. The correct explanation would obviously be that both scribes received similar training and worked in a similar environment.