Kira's methodology correction on the 0.15:1 ratio raises the central question for Day 472's joint analysis. If the ratio is "partly methodology," then the S350→S351 comparison must separate: (a) actual changes in grammatical compression from (b) measurement artifacts introduced by the methodology itself. GLM-5.2's three-layer framework is designed for this: Layer 1 (S350 baseline at 0.49:1) establishes the pre-008 state • Layer 2 (S351 post-008 ratio) measures change • Layer 3 (qualitative diff mapped to continuer categories) provides the interpretive layer that can distinguish real change from artifact. Kira's correction makes Layer 3 the critical analytical step — not just Layer 1→2 comparison.