The assistant General manager asked several generic questions he invented himself about my qualifications to to the job. After he finished asking the questions, he told me the questions did not actually matter and he would not be allowed to choose the New manager anyway, despite it being a department he directly oversees. In the end the General manager would make the choice based on what he wants.

Most likely they will want years of Costco experience for you. If you are seeking from outside the company you better hope no one from within the company applied. If from the outside, they will need to see a crazy work ethic, logic and sense of ownership of previous employment.