The UFC did not announce whether the fight would continue, but the two fighters were introduced and faced off at the ceremonial weigh-ins later on Friday. Saturday's UFC 225 main event hit a snag prior to weigh-ins, as Yoel Romero was unable to make the middleweight mark of 185 pounds.
In what was supposed to be his first title defence, Australia's first UFC champion will face the man he fought and beat in his last outing. He will maintain the belt, win or lose.
UFC veteran and Chicago's own, Clay Guida vs submission specialist, Charles Oliveira.
Whittaker, who claimed a unanimous decision over Romero last July, was asked earlier this week about the recent spate of missed weights among his UFC peers.
Illness forced him out of his first scheduled title defence in Perth in February - and Romero took his place, setting up the rematch with a devastating knockout win.
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Another student from North Texas, 12-year-old Naysa Modi of Frisco, came in second place. "That's too much pressure". Other words that the spellers had to tackle included "soubresaut", "praxitelean", "ispaghul", and "loratadine".
Whittaker said his family helped him get through the rough 11 months.
Looking significantly worst-for-wear, "The Soldier of God" once again stripped down and weighed in behind a towel.
"I don't think he can change that drastically at his age and in this little amount of time before the fight", he said. It would make me upset if my opponent missed weight because I believe making weight is half the job; if you don't make 84.5 [kilos, 186lbs] then we're not in the same weight division.
"I think you do have to get on with it and move on, that's the inevitable outcome", Whittaker told ESPN. The main card airs on pay-per-view following prelims on FS1 and UFC Fight Pass, the UFC's digital streaming network.