diff --git a/docs/re/structures/isl-message-dialogue-link.md b/docs/re/structures/isl-message-dialogue-link.md
index 2caa890c..a0cfe5cd 100644
--- a/docs/re/structures/isl-message-dialogue-link.md
+++ b/docs/re/structures/isl-message-dialogue-link.md
@@ -174,6 +174,40 @@ The difference is not academic:
     MSG_VOICE_D_342  "Katana, Ellen, good work."  eng 4.18 s   jpn   -
 
 ❔ Not settled: the 38 % of call sites with no English duration. They are
-headerless banks, so the audio exists but its length is not recoverable from a
-`seek` table — it would have to come from the packet count, which for a
-headerless bank means the whole entry, and the entry is not the wave boundary.
+headerless banks. **A `seek`-based recovery was tried and does not work** — see
+below.
+
+### ❌ Recovering headerless durations from the `seek` chunk — tried, refused
+
+A headerless bank has no `RIFF`, so no `data` size to read. But a `seek` chunk
+describes the wave *ending* at its own position, so an entry carrying one looks
+like it should yield a length for free. Across the bank set:
+
+| | eng | jpn |
+|---|---|---|
+| has a `RIFF` (already covered) | 3 686 | 4 301 |
+| headerless **with** a valid `seek` | **343** | 419 |
+| headerless, no `seek` | 353 | 380 |
+| no entry for that language | 753 | 35 |
+
+343 recoverable English durations would lift coverage from 62 % to about 75 %,
+and the numbers look right — median **3.25 s**, p90 5.18 s, which is exactly the
+shape of in-mission voice.
+
+**It is still wrong.** A `seek` sits immediately after *its own* data, so the
+implied wave start is `seek_pos − packets × 2048`. Checking that:
+
+    wave starts BEFORE the entry begins : 277 of 343
+    wave starts inside the entry        :  66 of 343
+
+**For 277 of the 343, the `seek` describes the previous bank's wave, not this
+entry's.** That is the same pairing rule that made my earlier `seek` readings
+fail; taking the length anyway would attach a neighbour's duration to 81 % of the
+recovered rows. Even the 66 that start inside the entry are not *proven* to be
+that entry's own wave — "starts inside" is necessary, not sufficient.
+
+The median 3.25 s is precisely the kind of plausible-looking figure that has
+already misled this work twice today, so the approach is recorded as **refused**
+rather than applied with a caveat. Recovering these lengths needs the bank→wave
+assignment settled first — the open question `auto/slb-loader` records as *"which
+bank in a window belongs to the entry's name"*.