Switch System

[oshfdk]

But the real question is why is there a lot of the one in the one section and a lot of the other in the other section.

If we work under plaintext assumption, this could be different topics affecting vocabulary. For example, if one part of the manuscript mostly talks about ingredients and preparations, there will be a lot of "cut", "take", "remove", if the other part talks about the stars, there will be a lot of celestial geometry and nothing to cut, take or remove. Hence, overabundance of "ut" and "ov" in the first part.

I'm much more inclined to think that Voynichese as a ciphertext, and the explanation could be as simple as two different keys/mappings/cipher variants.