Marble colour = what really started the journey:
AI visibility
SEO
Paid ads
Dashed = GA4 can't see it
Every marble is one sale. The pipe weights are illustrative, chosen to show the mechanics, not measured from any real site. Data-driven credit is a stand-in, because Google's real model is property-specific and unpublished. Channel names follow the GA4 default channel group and models follow GA4 attribution settings. Some AI clicks land in Direct because the referrer is lost, as Search Engine Journal reported.