The Custodian acts as an automated governance layer that monitors how well the current Rank Factor taxonomy explains observed ranking shifts. When a property accumulates enough claims classified into per-class other buckets, it triggers an LLM analysis to identify coherent sub-patterns and propose new, specifically defined factors under a pending approval status. This human-in-the-loop workflow prevents taxonomy drift while ensuring emerging ranking signals are properly named, structured, and reviewed before influencing the acquisition policy.