Islam Makhachev believes Justin Gaethje has nothing left to prove after becoming UFC champion. AdvertisementAdvertisement AdvertisementA former WSOF champion, two-time interim UFC champion, BMF champion, and now undisputed champion, Gaethje has put together quite the resume in his MMA career. UFC welterweight champion Makhachev wasn't entirely surprised to see Gaethje hand Topuria his first-career loss. "I said before that fight, Justin is a warrior," Makhachev said. This article originally appeared on MMA Junkie: Islam Makhachev remarks on Justin Gaethje's uncertain future