#2. A clean drug-testing record
'DC' is a UFC legend for many reasons. His only issue has been weight management. He has been disciplined in every other aspect of the fight game. The proof of this discipline is his stellar drug-testing record.
'DC' was the first mixed martial artist under USADA to reach 50 clean tests. Cormier also has 30 clean tests from his wrestling days. As of March 2020, the 42-year-old had passed a total of 80 drug tests.
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Jones remains unbeaten, but from 2015 to 2017, he failed three drug tests.
#1. Two-division UFC champion
Daniel Cromier defeated heavyweight Frank Mir in his UFC debut. He soon moved down to light heavyweight. In his first fight at 205lbs, Cormier TKO'd Patrick Cummins in round one. In his next bout, he dominated veteran and MMA legend Dan Henderson. Henderson had no answer to Cormier's superior wrestling.
The former Strikeforce champ was then booked to face Jon Jones. Tensions between the pair even resulted in a physical confrontation on the UFC 178 press tour. On fight-night, Jones won a hard-fought unanimous decision.
However, 'Bones' soon got stripped of his title due to a hit-and-run incident. So 'DC' fought Anthony 'Rumble' Johnson for the vacant light heavyweight title and won. He then edged out Alexander Gustafsson in a split decision win. A second fight with Jones got canceled. The former champion tested positive for performance enhancers and was removed from the UFC 200 card.
Anderson Silva replaced Jones on late notice, but 'The Spider' could not defeat 'DC'. Arguably the best middleweight in UFC history could not withstand Cormier's wrestling. Cormier followed this up with a second victory over 'Rumble' via submission.

'Bones' and 'DC' finally met again at UFC 214, and Cormier lost. However, Jones again tested positive for performance enhancers. He was stripped and 'DC' was reinstated as light heavyweight champ. Cormier moved up to heavyweight after beating Volkan Oezdemir. At UFC 226, he defeated Stipe Miocic to become the heavyweight champion.
'DC' became only the second man to hold two UFC titles simultaneously. The Olympian has lost three times in his career. But his achievements are yet to be matched by any other light heavyweight, including Jon Jones himself.