Diego Dávalos was not present at the 1540 muster. In 1546 or 1547 he stated that Viceroy Mendoza had provided him with a horse and other things in order to participate in the Expedition. Thus, he was a criado of Mendoza. Otherwise, we have no explicit documentary evidence about him.
AGI, Justicia, 263, Pieza 1, “Probanza de Mendoza, Zacatula, 1546-47” [de parte witness, reverendo padre Juan Vanegas tells several interesting things] [a Diego Dávalos, a soldado on the expedition told Vanegas “como el dicho visorrey le habia dado un caballo y otras cosas que no se acuerda para pasar la dicha jornada”]
?AHN, Sección Nobleza, FERNAN NÚÑEZ, C.277, D.47 [1578: Inventario de bienes de Diego Dávalos vecino and regidor of Cuenca; doña Aldonza de Riberaneria is his wife; his wife has died and an inventory is being taken, 6 Nov. 1578 (possible relation?)]