"Truth is one; the sages just speak of it in different ways."
Because the cities mentioned *are* in the Top 50 Metro areas:http://en.wikipedia.org/wiki/Table_of_United_States_Metropolitan_Statistical_AreasSumner is using central city data, which can be misleading in a number of ways (including ability to support a pro football team). For example, as a city, San Francisco and Columbus, OH are roughly the same size, but SF MSA is almost 2.5x larger. Or Omaha is slightly larger than Minneapolis as a city, but the Twin Cities MSA is over 3.5x larger.
Gene, there aren't that many people on a football team. Even high schools can field them.