#4 Edson Barboza
This is one tough fighter. What Edson Barboza lacks in height, he more than makes up for in intimidation, with his ferocious attitude inside of the octagon being dwarfed only by his terrifying facial expressions. A big part of turning The Undertaker into a success was, and still is being able to tell a story only through the look on your face.
Barboza is a master in psychology and he could easily play the role of a guy who can get inside his opponent's head, but can also unleash a barrage of vicious attacks when push comes to shove. He may not be the most obvious selection, but if you give Edson the ball to run with then we have no doubts he could add a whole new layer to the Taker character.
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We conclude with a man who possesses phenomenal knockout abilities.