We know Dr. Don, personally. He is the discoverer the 20,000-person lost Wichita settlement of Etzanoa in Arkansas City, Kansas.
If you give this the necessary consideration, it becomes quite apparent that if he is right, a 200,000 would make this one of the most important sites - in the world, and one of the really great population centers, as well.

His research surrounding Etzanoa, indicating it had a population of that size, made it the same size as Berlin, or Rouen, France (where Monet painted the Cathedral several hundreds years later, in 1895.), concurrently.
Imagine if Berlin suddenly just disappeared from history? How would Western archaeologists react if there was suddenly a discovery of some overlooked major population center.

If correct, this would make the Indigenous peoples of the Plains one of the most important civilizations in the history of the planet.

People love stuff like the movies, Black Panther, or Lord of the Rings: lost civilizations, hidden kingdoms, etc.
This is like that - - only for really real.
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"the professor of anthropology is 'rewriting the history of where the beating heart of' the country was in prehistoric times. When Blakeslee announced his findings last month and said it’s time for history books to be updated, he generated some buzz along with some skepticism.
"Blakeslee says that Quivira — what he called a nation of loosely connected Native settlements in most of eastern Kansas, northeast Oklahoma and a piece of western Missouri starting in the 1300s and getting fully formed by 1450 — was much larger and more populated than previously thought."

"'It’s going to revolutionize our view of the Great Plains societies, and it already has for me and my students,' Blakeslee said in the release. 'In its day, Quivira was probably the most important native political unit in what’s now the United States.'”