3. Ken Shamrock
Before Ronda Rousey and Matt Riddle traded mixed martial arts for wrestling, Ken Shamrock was the original. Already a champion in Pancrase and the UFC during the first half of the 1990s, Shamrock joined the WWE in 1997, and there was a lot of hype surrounding him. He was the first real MMA fighter to venture into the world of wrestling.
Shamrock was an imposing wrestler because of the legitimacy he brought to the table. He could literally destroy anyone he wanted to, and he had a lot of momentum during his first year in the WWE. He was the 1998 King of the Ring and won the Intercontinental Championship, but he never became WWE Champion.
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The lack of charisma might have been the reason for it, since he was not good at promos but good at raising his arms while shouting. Shamrock was too early for the Attitude Era but he would have been perfect in today’s Reality Era.