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Phase 6A: Better credit is ANTI-CORRELATED with loss decrease on fixed snapshot.
DFA (Gamma=0.01) → dL=-0.0001 (only method that decreases loss)
Vec_M4 (Gamma=0.38) → dL=+0.057 (increases loss most)
Oracle BP (Gamma=1.0) → dL=+0.011 (still increases loss)
Phase 6C: Target-shift rule reduces damage but cannot make non-DFA credits productive.
The inner-product surrogate <F_l(h), a_l> is fundamentally mismatched with directional credit.
Conclusion: Case B — the primary bottleneck is the local update paradigm itself,
not the credit estimator quality or tracking/co-adaptation.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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