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Kamaru Usman and Leon Edwards had their first formal face-to-face interaction of fight week at the UFC 278 pre-fight news conference.      Related StoriesKamaru Usman says no need to put on weight for 205 pounds: 'People don't understand what my death grip is like'Kamaru Usman says no need to put on weight for 205 pounds: 'People don't understand what my death grip is like' - EnclosureUFC 278 video: Paulo Costa, Luke Rockhold scare Dana White at faceoff