Conventional wisdom pegged ring rust as the reason why Jon Jones, the fighter regarded by so many as the greatest mixed martial artist of all-time, didn't quite look like himself in his first fight in 16 months.
Others point out that his opponent at UFC 197, Ovince Saint Preux, is far tougher than he's gotten credit for. OSP, after all, has been in there with everyone from Shogun Rua to Glover Teixeira, and he's never been knocked out in his 16 combined UFC and Strikeforce fights.
But Jones' nemesis, UFC light heavyweight champion Daniel Cormier, has another theory.