I happened upon this news post on MMA Junkie. In it none other than former 7th dan in Aikido, Steven Seagal, allegedly spends an hour or so teaching Cormier some “secret techniques.”
These serious MMA players have a training team that reviews opponent footage and also helps them develop a training plan and fight plan. Given that literally months of work go into preparing for the next opponent, I highly doubt that Cormier will integrate anything Segal-san taught him, only a few days before the fight!
Unless, however, the secret technique was how to best attack the post-fight buffet…