Naming the gaps
Every missing link carries a reason. There are four, and the differences between them are the entire point of this pillar.
classified
The information exists, is held by the government, and has been formally withheld.
This is the strongest of the four, epistemically, and it is the least intuitive fact about it: a
classified gap tells you the material exists and who has it. That is information. It is a very
different situation from not knowing whether anything is there.
suppressed
The information exists and has been actively kept from circulation — removed, unpublished, settled with a non-disclosure term, or buried.
Differs from classified in who did it and under what authority. Often the harder one to source,
because suppression rarely announces itself.
blocked
The information could be obtained, and someone is preventing the obtaining. Access refused, requests stonewalled, litigation outrunning anyone's ability to fund it.
The distinctive feature is that this gap is maintained continuously. It is not a past act; it is a present one, and it is happening while you read the chain.
unknown
Nobody has looked, or nobody knows. The honest default.
Why these must never collapse
The first three are acts by somebody. The fourth is a state of the world.
Collapsing them into a single "we do not have this" is exactly the move the deadlock depends on. It converts "the party this conclusion is about is withholding the decisive document" into "there is some uncertainty here" — which sounds like modesty and functions as a defence.
Keeping them separate lets a citizen say the true and specific thing: the missing link is missing because the subject of the claim is holding it, which is itself evidence about the claim.
What naming a gap does not do
It does not fill it. A named gap is still a gap, and the conclusion still has to survive its absence.
What it does is make the shape of your ignorance explicit, so a reader can evaluate your conclusion against it instead of taking your word for how complete your picture is.
Gaps are published, not hidden
The movement applies this to itself. Every calculation over the public record emits its gaps, and they render on the page. A named gap is a real finding, and it tells somebody exactly what would close it.