He is in Vegas for Saturday night's UFC 226 event.
"I, ugh, I, ugh, I was a heavyweight a long time and I left the division", Cormier (21-1) said.
"Every person I fight is bigger than me", Cormier said this week in Las Vegas.
"I don't know if he's the [greatest of all time]".More news: Wozniacki Eats Bugs, Joins Seeded Exodus at Wimbledon
For all the talk about champion-vs. -champion bouts over the years in the UFC, their actual history is just two chapters long. Now let's understand that Miocic was also an NCAA DI wrestler, so he is more adept at the ground game than Cormier's last power punching opponent but it won't be enough to get him out of the weeds when DC goes to the ground-and-pound.
"Yeah, you're strong", Cormier said.
"I am 39 years old, and I've been second a lot of times, but today I finally accomplish everything".
For now though, Cormier has firmly inserted himself into the "Greatest Of All-Time" conversation along with the likes of St. Pierrer and UFC flyweight champion Demetrious Johnson.More news: Mother Teresa's Missionaries of Charity worker charged for 'selling' newborn
Cormier is at least 5 inches shorter than the 6-foot-4 Miocic, who has a whopping 8-inch reach advantage.
And, after an exhilarating start to the bout that saw both men trade heavy leather, Cormier made the crucial breakthrough in the final minute of the opening round. "I got some pictures to take".
Cormier, the light heavyweight champion, is moving up to challenge the heavyweight champ for the possibility of following in the footsteps of Conor McGregor as the only fighters to simultaneously hold UFC belts in two weight classes. Lesnar eventually got on the microphone and put Cormier on notice after taking a shot at the other UFC Heavyweights. "Your days are in the past. Your day is in the past; 2010 is like the stone age". There are conflicting reports about whether Lesnar has re-entered the USADA drug testing pool which is required for six months before returning to action, so a potential superfight between the WWE star and two-division champion may be postponed until 2019. He was the first heavyweight fighter to win three title defense matches; now, he will go for number four.More news: Who's saying what at the World Cup