Can anyone tell me why Chief Wahoo McDaniel never became The NWA World Heavyweight Champion?

Chief Wahoo McDaniel was one of the best wrestlers and one of the most dominant wrestlers in The National Wrestling Alliance during the 1970's and 1980's, why was he never The NWA World Heavyweight Champion?
Update: John Morrison: This is about The National Wrestling Alliance, not The World Wide Wrestling Federation or The World Wrestling Federation or World Wrestling Entertainment. The NWA is where Chief Wahoo McDaniel wrestled the majority of his illustrious career.
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