Cortez had 1000s of Indian allies who hated the Aztecs so it wasn’t just him and a few caballeros.
Another interesting thing about the Spanish conquest of the Aztecs is a direct descendant of Montezuma survives to this day as part of the Spanish nobility. Also the Spanish ennobled several of the caciques of his Indian allies. Their descendants are also in today’s Spanish nobility.
Near as I can tell Pizarro wasn’t so accommodating!
Duke of Moctezuma de Tultengo
Duke of Moctezuma de Tultengo (Spanish: Duque de Moctezuma de Tultengo) is a hereditary title of Spanish nobility held by a line of descendants of Emperor Moctezuma II, the ninth Tlatoani, or ruler, of Tenochtitlan
https://en.wikipedia.org/wiki/Duke_of_Moctezuma_de_Tultengo
Pizzaro was Cortez’ second cousin. He learned from Cortez and was even more ruthless.