This document summarizes research on isomorphism in Nahua dialectal morphology. It makes three main points: 1. Modern Nahua dialects are becoming more regular and less irregular compared to older dialects like Classical Nahuatl. 2. Some features identified as characteristic of "Urban Nahuatl" by Canger may actually be older features that predate the Aztec period. 3. Irregularities in Classical Nahuatl could date back to when the Mexica people were nomadic before founding Tenochtitlan. The document examines specific morphological examples like reflexive prefixes and the verb 'to go' to support these arguments. It aims to re-evaluate the idea that Urban