The bond between Elevation Fight Team partners Kamaru Usman and Justin Gaethje has been well documented in recent years through various episodes of “Embedded,” “Countdown” and other UFC-produced video features, so it should come as no surprise to see one relish in the other’s success. And that’s just what happened Saturday at UFC 291 in Salt Lake City. In the night’s main event, Gaethje landed a vicious head kick to knock out Dustin Poirier in their rematch for the “BMF” title
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