Are Foldouts Always Shorter to Left but Longer to Right?

[ChenZheChina]

I checked René Zandbergen’s website about quire schemata, and found that all foldouts are bound in a way that their left is shorter while their right is longer.

Images are downloaded from René’s website.

   
Quire 9: 2-page wide to the left, 3.5-page wide to the right

   
Quire 10: 1-page wide to the left, 2.5-page wide to the right

   
Quire 11: 1-page wide to the left, 3.5-page wide to the right

   
Quire 14: 1-page wide to the left, 2-page wide to the right

   
Quire 15: 1-page wide to the left, 2.5-page or 2-page wide to the right

   
Quire 17: 1-page wide to the left, 2-page wide to the right

   
Quire 19: 1-page wide to the left, 2-page or 2.5-page wide to the right

So here’s my question: Is this phenomenon just a coincidence, or a common practice at that time? In other words, is it possible for the original author to design pages that to be bound in a way where left foldout is longer than right foldout?

I want to ask this question, because I am trying to review and re-order Herbal-B pages. When I was examining the foldout f94-f95, I wondered that if I could bind between what is now referred as f95v1 and f95v2, a.k.a. f95r1 and f95r2, like this: