I've been thinking of him as a warrior from the commoner class or as a priest who was accepted into the calmecac from the same lower class because of his high capabilities (it was possible to accept children who were talented and with good qualities); and the priest version slowly took over - Quetzalcoatl, whose feathered-serpent form olrox takes, is a patron of knowledge, learning and priests; while it is symbolical - for a priest after spanish invasion and all the consequences (erasing of culture, persecution of the religion, converting into the christianity) to have this form in the manner of some kind of support, it also creates a common ground and parallels between olrox and mizrak in the aspects of religion, harsh duty, devotion to divine beings and theological questions, which i found fun to explore :)

i also thought of him being on lesser position in hierarchy - maybe as an offering priest, who could have got higher due to the fall of Tenochtitlan and immense decrease of population.