I also think there are two sections and came to much the same conclusions as the ones you mention. However, I'm starting to doubt this recently and I am able to see them as one whole. Everything taken into account though, I do believe the bifolios are out of order, but this does not mean that they were really separate sections.
Still, something useful can be said about the distinction between the two types of bathing folios, and a standard term for them would be handy for me as well.
You are right about the word calendar bearing implications as well. Month roundels, then? They are roundels and month names have been written on them, that's a neutral observation.
Edit: by the way, I've gotten used to calling the bathing section "Quire 13" or Q13, that's quite easy to remember. I think a similar argument can be made for calling the last quire "Quire 20" or Q20.
Still, something useful can be said about the distinction between the two types of bathing folios, and a standard term for them would be handy for me as well.
You are right about the word calendar bearing implications as well. Month roundels, then? They are roundels and month names have been written on them, that's a neutral observation.
Edit: by the way, I've gotten used to calling the bathing section "Quire 13" or Q13, that's quite easy to remember. I think a similar argument can be made for calling the last quire "Quire 20" or Q20.