I don't know about this one PhotonGuy, I am going to have to think that over, at least from my perspective...
The process to each belt is generally a long one, relative to each phase. I never really thought, "now what is the bare minimum I need to pip this belt test"? I am not aware of others with this approach either, normally (and from my own experience, and especially when I was younger) students (not always rightly) are dying to soak up and take on as much as they can and beyond the level they are at or about to grade for...
Also, I never really went into "training camp" mode for a belt grading, unlike with tournaments. While you may be working your kata more towards a grading, generally you should have all the skills and understanding already to hand leading up to a grading - I never saw it as something one had to "peak" for.