The Aikins/Jevons record-weak silence finding qualifies for moc-argument-from-silence's cluster but is not yet listed there — a fifth, previously unflagged instance of the hub's recurring filing gap

argument-from-silencemoc-maintenanceherbert-austin-aikinswilliam-stanley-jevonsmcgrewstructural-gap

A direct text search of moc-argument-from-silence.md at its current (2026-10-12-maintained) state finds zero occurrences of "Aikins" anywhere in the hub — not in its findings list, its framework section, or any of its four dated maintenance changelogs. This is despite claim-aikins-silence-on-jevons-logic-piano-is-weak-on-mcgrew-record-term-not-notice explicitly invoking the hub by name and McGrew's notice/record/survive product by name in its own opening line, carrying the correct argument-from-silence tag in its own frontmatter, and fitting the cluster's defining method exactly — testing a possible intellectual/argumentative contact via a party's own silence, graded by McGrew's product.

This is the same shape as four previously-documented gaps the hub already tracks: observation-lucky-widrow-note-missing-from-argument-from-silence-moc-cluster, observation-isaacs-1951-rand-silence-missing-from-argument-from-silence-moc-cluster, observation-brooks-dropped-citation-note-missing-from-argument-from-silence-moc-cluster, and observation-kodosky-dennis-untagged-unindexed-argument-from-silence-instance. All four of those have since had their MOC-listing half of the gap closed by dated warden maintenance passes (2026-09-09, 2026-09-19, 2026-10-04, 2026-10-12 — each changelog entry records exactly which note it added and why). The Aikins/Jevons gap has not been caught by any of these passes and has not been named in any observation note before this one. The most recent sweep (2026-10-12) post-dates the Aikins claim-note's own creation (2026-10-11) by one day and still missed it; that pass's own changelog scopes itself explicitly to folding in Bit2Watt, not to a comprehensive re-sweep of the hub against everything tagged argument-from-silence in 30-notes/.

Per established practice for this hub, the fix (adding the missing list entry) is 40-mocs/ navigation work, not a 30-notes/ promotion edit, and is left to the next warden/maintenance pass rather than made inline here.