diff --git a/docs/re/BACKLOG.md b/docs/re/BACKLOG.md
index c81a5b6..69439b9 100644
--- a/docs/re/BACKLOG.md
+++ b/docs/re/BACKLOG.md
@@ -6019,3 +6019,44 @@ Right instinct, wrong mechanism — same pak, different prefix.
 
 🟡 Not settled: why `S28_p1` has an asteroid volume with no definition; what
 `Placement_*`/`RouteTest_*` are for; the two unnamed `_Test` variant objects.
+
+---
+
+## 🔴✅ 2026-08-28 — the 2D/`GP_READY_ROOM` blocker: retry already done, but two new structural facts
+
+Item (a): retry the 🔴 blocker with the "wrong prefix" lesson from
+`StageMessageSet_S02.tbl` (which resolves under `message\`, not `stage\`).
+
+🔴 **The retry was already run, and the owning doc says so.**
+[[archive-naming]]'s "13 name transformations" list already includes `2d\`,
+`eng\`, `hud\` and `GP_MAIN_GAME_2D\` prefixes — **every one scored 0**, against
+both the E2D pak and all 16 630 entries. Reading the doc end to end first would
+have shown that in one minute. Recording it so the idea is not proposed a third
+time.
+
+✅ **What the re-open did add — two measurements the earlier passes did not make.**
+
+1. **The six 2D archives share ONE key set: 711 keys, identical in all six.**
+   Intersection = union = 711; 4 266 entries, 711 distinct keys. The entry
+   **names are language-independent** — the language lives in the pak *file*
+   name, not the entry path. That refutes any `<lang>\` prefix hypothesis
+   **structurally**, not merely by a zero score: if the names carried a language
+   directory, the six key sets would differ.
+2. **The 2D key space is disjoint from the rest of the disc** — **0 of 711**
+   appear in any non-2D archive, while disc-wide **2 010 of 16 630** keys are
+   shared between archives. Sharing is common; this set simply never does it. No
+   named neighbour to borrow a convention from.
+
+⚠️ **The six named `GP_READY_ROOM` entries are all fonts** — `deu\GOTHICB.TTF`,
+`eng\`, `esp\`, `fra\`, `ita\` likewise, and `jpn\HGRGE00.TTF`. The doc recorded
+the count "6 named" without saying what they are: they are localisation fonts
+named from elsewhere on the disc, **not a sample of the archive's own artwork
+vocabulary**, so they cannot seed the dictionary attack the doc names as the last
+lever. (Only **2 of 1 106** `GP_READY_ROOM` keys appear in another archive.)
+
+🔴 **Still blocked, and now for a sharper reason**: the 2D names are
+language-independent, unshared, and absent from disc and executable alike. The
+dictionary-attack lever remains without a corpus.
+
+🟡 Not settled: why `S28_p1` has an asteroid volume with no definition; the two
+unnamed `_Test` variant objects; what `Placement_*`/`RouteTest_*` are for.
diff --git a/docs/re/structures/archive-naming.md b/docs/re/structures/archive-naming.md
index 7caeab2..fc27825 100644
--- a/docs/re/structures/archive-naming.md
+++ b/docs/re/structures/archive-naming.md
@@ -250,6 +250,34 @@ rather than improvised around.**
 *content* (T8aD, RATC), and the config records already say which asset each HUD
 element uses. Only the archive-key ↔ name mapping is missing.
 
+## ✅ Two structural facts that tighten the blocker (2026-08-28)
+
+Re-opened to retry the prefix idea after `StageMessageSet_S02.tbl` turned out to
+be a wrong-prefix problem (it resolves under `message\`, not `stage\`). **That
+retry was already done here** — the 13 rewrites above include `2d\`, `eng\`,
+`hud\` and `GP_MAIN_GAME_2D\`, all 0. What the re-open did produce is two
+measurements the earlier passes did not make:
+
+**1. The six 2D archives share ONE key set — 711 keys, identical in all six.**
+Intersection = union = **711**; `4 266` entries, `711` distinct keys. So the
+entry *names are language-independent*: the language lives in the **pak file
+name**, not in the entry path. That refutes any `<lang>\` prefix hypothesis
+**structurally**, not just by a zero score — if the names carried a language
+directory the six key sets would differ.
+
+**2. The 2D key space is disjoint from the rest of the disc.** **0 of the 711**
+appear in any non-2D archive (disc-wide, 2 010 of the 16 630 distinct keys are
+shared between archives, so sharing is common — this set simply does not do it).
+There is no named neighbour to borrow a convention from.
+
+⚠️ **And the six named `GP_READY_ROOM` entries are all fonts** —
+`deu\GOTHICB.TTF`, `eng\`, `esp\`, `fra\`, `ita\` likewise, and
+`jpn\HGRGE00.TTF`. The
+count "6 named" was recorded above without saying *what* they are; they are
+localisation fonts whose names come from elsewhere on the disc, **not a sample of
+the archive's own artwork vocabulary**. So they cannot seed the dictionary attack
+— the lever below still has no corpus.
+
 ## 🟡 Not settled
 
 * What names the 2D and `GP_READY_ROOM` TOCs actually hash. The one lever left is