#3 Francis Ngannou
Francis Ngannou is one of the scariest men in the UFC and that alone qualifies him for this position. The guy has frightening power combined with a calm and calculated nature that makes him something of a silent killer. That persona would mesh together brilliantly with the unknown entity of The Undertaker, and Ngannou would only grow as the years go on - much like Calaway did.
The Predator would match up brilliantly with a number of talents in the WWE, and he could go on to thrive in any role necessary whether it's as a babyface or a heel. His skill set is second to none and when it comes to potential within this character, Ngannou may well be top of the list as he just has so many different traits going for him.
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Onto a man with a name that matches his stature.