Searching for "Rex Tillerson" is the perfect example. (Remember him?)
Typical news searchers are looking for a much wider swath of news than just the latest on the former U.S. Secretary of State. In my own experience, that includes local news (what were all those police cars doing last night?) and lots of sports news, business/tech/entertainment news, scientific news, etc. Those articles come from a much wider assortment of news outlets, and I think Google does a decent job of finding them.
There's a limit to how many news organizations can generate meaningful coverage about Rex Tillerson. I'm at peace with the idea that Google has found most of the ones that matter.