How are we defining "urban" in the context of a discussion about Mesa? According to the New York Times'
census widget, Mesa's highest-density census tract (tract 422103) works out to 17,481 persons per square mile. That may look impressive on paper...but then you look at the way it is built out....
https://goo.gl/maps/p2igHTMiYpEMLcGv5
https://www.google.com/maps/@33.3948...7i16384!8i8192
Ouch. While some may perceive that area as 'urban,' I don't.
Basically, we can look at it a couple of different ways: Mesa as a nondescript stretch of greater suburban Phoenix, and/or Mesa as a major American city in its own right. If it's the former, then it's not a 'twin city.' And if it is the latter, then it is the most unimpressive and boring major city in America, with the smallest downtown and the absolute worst skyline. Either way, the answer to the thread title is "no."