Why was Futahaguro Koji promoted to yokozuna without winning a single Grand Sumo Championship?

Actually I posed this a few minutes ago under the heading of who was the yokozuna who did not win any championship and why was he promoted to yokozuna, but the response was that he was Futahaguro Koji but did not give the reason why he was promoted a yokozuna, thus this question. Thanks for the info.
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