3. Mr. Kennedy
One of the most wasted superstars of the Ruthless Aggression Era, Mr. Kennedy had it all. A great heel gimmick, charisma, mic skills, and he can put up a great wrestling match. Kennedy even had wins against a lot of former world champions such as Batista, The Undertaker, and Kane.
The WWE had big plans for him including being the original choice as Mr McMahon’s illegitimate son that could have culminated with a WWE championship run. Mr. Kennedy even won the Money in the Bank briefcase in 2007 that guaranteed him of a title opportunity at any time and any place.
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However, injuries prevented him from reaching his full potential. A misdiagnosed triceps injury forced him to relinquish the briefcase, losing on the chance to become a WWE champion. He was released in 2009 after Randy Orton and John Cena allegedly complained to Vince McMahon about Kennedy being an unsafe worker.