Raison d'etre of the Voynich?

[Mark Knowles]

It is only through comparison that connections can be made.

Certainly commonalities are what one should look for i.e. ways in which the Voynich is less unique. So clearly some commonalities with other documents of the time can be found. Though similarities in specific ways with other documents can be observed, the Voynich manuscript as a whole remains unique. So it is locally not unique, but globally is unique.