I doubt the ad organization and ranking teams decide where and how many sponsored listings appear in search results, which I believe is GP's point: the page des

I doubt the ad organization and ranking teams decide where and how many sponsored listings appear in search results, which I believe is GP's point: the page design/layout and the proportions of ads vs. (more or less) organic listings. Someone decides that searches have e.g. four ads at the top and two at the bottom.