|One of the Norsigian images|
The woman, Melinda Pillsbury-Foster, says the Norsigian images look a lot like images made by Arthur C. Pillsbury, a noted photographer of the period. The good this about this story is that I'm learning about some notable people I've never heard of.
It also seems that the Brooks claim has had a boost in recent days: Uncle Earl's grandson released Brooks's 600-plus page memoir and some old photo albums, one of which has an image "that matches," as the Times put it, an image that Norsigian claimed as an Adams.
I would say this: If you know that one of our great uncles, grandfathers, or sundry relatives visited Yosemite in the 1920s, and carried a camera, it wouldn't hurt to try to find their pictures. Maybe you're sitting on a fortune. Or maybe not.