#1 Not afraid to fight in the division of giants
Let's face it, Daniel Cormier spent a better part of his career in the Heavyweight Division, and primarily dropped down to Light-Heavyweight out of respect for his longtime training partner and team-mate Cain Velasquez who was the Heavyweight kingpin at the time.
DC found tremendous success at both weight-classes, and was unafraid while moving up to face whom many regarded the greatest Heavyweight MMA fighter of all time -- Stipe Miocic. As opposed to that, Jon Jones, despite being significantly longer than most Heavyweights, has time and again refused to move up to the division of giants -- a division in which he'd probably dwarf most of said 'giants'!
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Additionally, his fights against Cormier took place at Light-Heavyweight, and not Heavyweight -- thereby giving Jones an innate advantage, since the younger an adult athlete is, the easier it is for him/her to cut weight. Despite the myriad of advantages Jones enjoys over DC, as well as the steroids/PEDs which are said to have helped Bones beat his much older rival; the fact remains that Cormier truly is better than Jones.