An interesting detail in the Huastec link was that they moved across the Isthmus of Tehuantepec in their travels to the north and east. More than 40 years ago when I was traveling around Mexico, I was told that the Tehuana women were culturally dominant and strong and attractive, while their men were small and meek. Perhaps these two cultures are in some way related or were the origin of a phenomenon that has lasted for millenia.
Maybe a DNA test would tell?