#5 Would have been great: Bruce Lee
Lee Jun-fan, known by his stage name Bruce Lee, was perhaps single-handedly responsible for making martial arts culture popular in the west.
Lee pitched and auditioned for a television series featuring a Shaolin Monk wandering the Old West, but racism in Hollywood led to a white man, David Carradine, getting the lead role. Undaunted, Bruce Lee made films in his native Hong Kong until he gained international stardom with 'Enter The Dragon'. Sadly, Lee would pass on before he saw himself rise to the status of a true icon.
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Bruce Lee obviously had the chiseled physique and athletic ability to be a WWE Superstar. However, he also had charisma and the ability to speak articulate, if accented, English. His intensity and personality would have made him a top tier performer in WWE had he decided to go in that direction with his career.
He could have also had special match stipulations and match setups that would help showcase the martial arts world to the WWE.