f89, f102: folds planned, then shifted towards spine?

[Koen G]

I get the opposite conclusion.  namely, when the Scribe penned those bifolios, he did not intend for those folios to have a second fold.  He expected that there would be only two flaps, and two pages on each side. 

There are in fact traces of other folds that do damage glyphs willy-nilly. But what stood out to me is that on these two foldouts, there are indications of fold-avoidance, and in both cases at some distance outward from the current fold. The spacing isn't random, because on both foldouts, a similar behavior is seen on the recto as on the verso. The scribe places their paragraphs or word spaces based on where they expect the flap fold to be.