BFM-decomp/cookbook/C0468.md

§420 ★★★ — A MULTI-CLUSTER SYMBOL REBASE, AND THE BARE-NAME DEDUP THAT HID THREE QUARTERS OF IT (P31 S71; 4 banked in 57 s)

The shape. One shared body (func_8016AB6C) lives in four overlays — ov_SC03_107, ov_SC07_007, ov_SC07_010, ov_SC07_011. Every copy scored match_one closeness 0 and every copy failed the gate with undefined reference to D_8018D538: the classic §171 stale-seed-symbol class, the draft carrying the symbols of the overlay it was written for.

Defect 1 — aprop_symfix deduped the slate by BARE FUNCTION NAME (R48/§238). A four-row slate reported "1 drafts audited". Three rows were silently dropped, and they were not redundant: each overlay needs a DIFFERENT rebase, because each has its own target symbols. Keyed by (binary, fn), all four audit. This is the same defect class as reloc_filter's binof (fixed earlier the same session) and gate_lane's homonym staging — three tools, one root.

Defect 2 — the delta rule allowed exactly ONE uniform cluster. STALE-DELTA requires the sorted zip to have a single target − draft delta, so it refused all four as AMBIGUOUS. The real structure is two clusters of two, and it is identical in shape across all four overlays:

overlay	run 1	run 2
ov_SC03_107	−0x7F64 ×2	−0x5A650 ×2
ov_SC07_007	−0x74DC ×2	−0x2E898 ×2
ov_SC07_010	−0x844C ×2	−0x4E3A0 ×2
ov_SC07_011	−0xBD8C ×2	−0x65D08 ×2

Two data clusters, each moving as a block — exactly what one seed body copied into four overlays produces. The single-delta rule is the special case of one cluster.

The safe generalisation. Sort both symbol lists, zip positionally, split into runs of constant delta, and require every run to have ≥ 2 members — a single-member run is a free guess, not a cluster, and that is where a wrong symbol would come from. Filter to D_8xxxxxxx first: the draft's Ent_/Obj_/SVec_ typedef names and the target's rand/jtbl_ carry the same vram-looking suffix and are not data symbols.

Result: 4 banked in 57 seconds of gate time, zero drafting — and all four had been sitting at closeness 0 behind a symbol rename. Verify after rewriting (match_one again, all four still MATCH) before gating; a rebase that changes the body is a rebase you got wrong.