Hombre de Maiz wrote: When he heard of the riches of Peru, he set sail in assist Pizarro in the looting and pillage. He soon ran into difficulties with his fellow conquistadores over the spoils. He sailed back to Guatemala. It was probably due to Alvarado's expedition that Quechua words began their diffusion in Mesoamerica.
That is what wikipedia says. Here is some of the rest of the story.
It's theoretically possible that de Alvarado might have been exposed to some of the Quechua in Ecuador and Perú but his stay there was so short, and his energies so involved and diluted in the conflict with Pizarro's people (actually in large part with Diego de Almagro, who would later figure in explorations of what became Chile), that there was scarcely time for him or his people to absorb much of the local culture and language. De Alvarado was essentially bought out by de Almagro for the reported initial sum of 100,000 pesos (later increased by 20,000 pesos) with the provision that de Alvarados's troops and cavalry horses pass to control under Pizzaro and Almagro's. The interloper, de Alvarado, ended up leaving almost all of his troops, ships, and equipment to Pizarro's people (for which there is an interesting historical "receipt" ) -- and sailed back in disgrace to Mexico (some later historians say Guatemala) with just one of the eleven ships he started out with, but his coffers quite full. Given de Alvarado's superficial and short-lived adventures in Perú and Ecuador, and the more extensive exchanges between the viceroyalties of Mexico and Perú that were to come in the succeeding years, I wouldn't give de Alvarado too much credit for extensive cultural diffusion.
But there is more to the story. Pizzaro and de Almagro knew that they were short-handed when de Alvarado arrived on the scene, and they believed that they were at risk of an uprising by the indigenous folk. Any sort of open conflict between the two competing Spanish groups might have allowed such an uprising to be successful, with the possible resulting expulsion of the Spanish from that region. By getting de Alvarado's troops and horses under their control, it is widely believed that Pizzaro and de Almagro were able to prevent such an uprising. Else the history of the region might have turned out quite differently.
Por lo que valga.