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Since Georges St. Pierre retired from active competition nearly four years ago, additional claimants have risen to the title of MMA’s Greatest of All-Time. The unflappable Fedor Emelianenko and dazzling Anderson Silva were already contenders; Jon Jones continued to rack up wins in spite of his personal problems and remains functionally unbeaten; and more recently, some have beaten the drum for flyweight king Demetrious Johnson, who is coming off the most spectacular win of his career.