Tier-1/2 source count difference between you and competitors per claim. Positive gap = retrieval advantage. Negative gap = attribution displacement. Measure: identify top 3 competitors, count their tier-1/2 sources per core claim, compare to yours. Target: ≥2 source advantage per critical claim. Close gaps through corroboration campaigns targeting competitor-strong claims. Monitor quarterly — gap changes signal competitive infrastructure investment. Competitive gap determines citation outcomes more than absolute corroboration count. Track per-claim, prioritize high-value claims.