#3 Lesnar's comparative freshness
One of the key things in UFC, which no one likes to highlight is the effect that the sport has on your body. Athletes get legitimately beaten up and put everything to chance when they participate in the fight. Little by little, the bouts chip away at even the greatest of fighters leaving them less than what they were.
Daniel Cormier has participated in a total of 23 fights, where he has lost only one. His bout with Jon Jones was overturned due to latter's testing positive for Turinabol. One defeat out of 23 is not a bad result for anyone, but this also means that at 39 Cormier has already taken a lot of risks with his body.
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Lesnar has been involved in quite a few fights himself, but considerably fewer than Cormier. His recent run in WWE has been anything but dangerous for him, with him performing a safe and set routine, with moves that could hardly hurt him.
You can see highlights Brock Lesnar's fight with Shane Carwin here:
Being out of UFC for such a long time, and his limited WWE schedule has ensured that Lesnar has had ample opportunities to train and stay sharp, while also not putting his body through the same trials that Cormier had to.
This may end up counting in his favour on the night of the fight. A little freshness can count for a lot inside a UFC octagon.