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Presidio soldiers were appointed to manage the ranchos (Life in Presidial California by Lothrop and Herczog). Sargeant Miguel Espinosa was in charge of the King's Ranch of Monterey (Memorias sobre la historia de California by Amador).
Without doubt, the bulk of the field labor was done by natives; whether they were Mission neophytes on leave, or exempt from missionization, I don't know.