C249 — The sixth row supports a final Flood endpoint but lacks the old cumulative start

23 September 2026 · Step 44 of 60, continuing C205.

The native member 4416t/4415n BC supplies a sixth row: Conquest AD 1404t/1405n double-expands to MT G3 Flood start AD 2460t/2461n, while the 13-fold second-stage endpoint is SP G3 primary Noah AD 3710t/3711n.

This row has source support for the new comparison, but its older cumulative-MT 3K-prefix construction would require 5297, outside the held 5296–5289 field. C10 already records that exclusion. A newly supported endpoint path cannot transfer support to a missing endpoint in a different path. The sixth row is retained only for the constructions it actually satisfies.

Evidence and scope

K=529 and r=25/23. BC base B means (B+1)t/Bn BC; reflected AD base A means AD At/(A+1)n. Their civil span is B+A in both seasonal components, with no year zero. Signed paired centers are −B and +A; the center model uses components ±1/4 and restores this separation after dilation. An interval center is geometry, not an event or a proposed universal Mirror axis.

Regular Gears are restricted to Noah/Shem/Flood. Creation and Conquest retain fixed source-field members; no fourth Gear is admitted. Generated coordinates, source-field membership and stored graph incidence are distinct. File_18/File_09 and the frozen C127 graph are unchanged. Earlier N01/N03 qualifications, the missing Shem join, closed primers and unestablished original Reports 11–25 remain unchanged. This packet selectively uses prior evidence; it does not rerun completed campaigns. Assertions and alternative placements are not independent historical witness counts.

4 step-specific checks and 19 frozen-input checks passed. Exact inputs, results and predecessor hashes are in the accompanying JSON records; calculation code is in the evidence archive. Source dependencies are identified in the body and frozen in sources/.