Key Difference: Google-Extended (not Googlebot) controls Gemini grounding.
User-agent: Google-Extended + Allow: / (separate from Googlebot!){"@type":"Organization","sameAs":["https://youtube.com/@your-channel"]}<h1> not <div class="header">Gemini Advantages: Native YouTube transcript parsing, Knowledge Graph integration, 1M token context (700K words), real-time Google Search grounding.