I liked how, in your review, you compared SubaHibi to that of an unsolved equation with a large amount of parts that comprised its whole. That is very true, and SubaHibi is indeed mainly recognized by a lot of people as a story which can only be freely interpreted in a subjective manner by the audience, since only Sca-ji really possesses the answer to the equation. However, from my own experience, I can't say I completely agree with that (which I'll explain why at the end of my post). Of course, to what extent you look into this story depends on how much of an utter completionist/perfectionist you are.
Here are my answers to you on those points you bring up as "A" and "B" (I can't fit the other points about Zakuro and the Gondola Ride here, so...):
A. SubaHibi's full title can pretty much represent the entire cumulative message. which is by default given to people when born.")
B. Explaining anything regarding Rabbit-Hole I involves delving more into interpretation, but I'll put it out here in-case you want to use it to build your own thoughts.
Anyways, I would still recommend you take a second or perhaps third look at everything. (Especially
Now regarding my experience interpreting and re-reading SubaHibi, I believe that SubaHibi's story, as an 'unsolved equation', most certainly has something along the lines of an 'answer' embedded within the story. It's just in a place that I or anyone else would've never thought to look.