An opportunity gap is a sub-query where retrieval returns thin or off-topic results — the question exists but nobody is answering it well. First-mover content has a direct retrieval path with minimal incumbent competition.
Opportunity gaps are where the highest retrieval leverage exists per unit of content effort. There is no incumbent to displace — the brand becomes the best available answer by being the only complete answer. The risk is that thin retrieval results may indicate a question nobody is actually asking; opportunity gap analysis requires human judgment about whether the sub-query represents genuine buyer intent.