Help me out here

[Linda]

Then we have the VM, no author, no key, no meaningful link between sections.

Indeed, there is a lot that we don't understand about the manuscript. No one topic, variable quality of illustrations, variability in language and writing, general untidiness.

It strongly suggests to me that the manuscript was not written in one go. That each section was written to be a separate piece of work and that the sections were then later bound into one volume. Bound together for the convenience of having all works in the unknown writing in one manuscript.

Agreed, and also bound jumbled up, since it was unknown. I think that only adds to the confusion, that things are out of order. I think quire 14 is folded wrong,  and quire 13 is completely out of order with some folios also requiring a flip amidst the shuffling. I imagine that is the case for other parts as well, especially the ones with different parts on one bifolio. Had the pages been bound by the makers, we might have seen at least the sections in more understandable groupings, and some better page order, both of which might have provided more context.