No. A drop in GLSA leads does not prove that the October 2026 migration affected your ad ranking. Lead volume can fall because of changes in search demand, competition, budget, eligibility, service settings, or how Google records and reports leads after migration.
To determine whether ranking or visibility changed, compare pre- and post-migration data, including impressions where available, lead volume, spend, cost per lead, service areas, and lead types such as calls, messages, and bookings. Also reconcile Google Ads records with phone logs and CRM data to rule out reporting or attribution differences.
If visibility declined while your budget, eligibility, and targeting remained stable, a delivery change may be contributing to the drop. However, you need evidence of reduced exposure, not just fewer leads, to support that conclusion.
