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UFC welterweight champion is still recovering from hand surgery, but the timeline for a return is not yet certain.      Related StoriesKamaru Usman's manager says August return 'completely not true,' but will '100 percent' fight in 2022 - EnclosureKhabib Nurmagomedov says he'd coach 'TUF' opposite Tony Ferguson: 'Not too many big stars in UFC right now'Gilbert Burns: Leon Edwards has best chance to dethrone UFC champ Kamaru Usman