"Google" of today is really AdSense ($102M, 2003) -> Android ($50M+?, 2005) -> YouTube ($1.6B, 2006) -> Google Docs ($50M+?, 2006)
Without those prescient and lucky acquisitions, we'd be talking about a "Google" that looked much more like Yahoo.
It wasn't search proficiency that built the empire, it was leveraging a transient search quality advantage into cash flow, then plowing that cash into acquisitions to construct a durable moat.