For most of Fury's career, he's fought off of his back foot, mostly moving backwards and playing the points game. He was pretty good at implementing that style, but he still had flaws like moving his head straight back and he was always susceptible to left hands. Then came the Otto Wallen fight. Wallen landed a left hand that badly cut Fury and at that point Fury had to completely change his style and come forward and be aggressive. He's fought that way every fight since that Wallen fight and he's been able to take advantage of his smaller opponents with his massive size and weight, not the technical wizardry that many of his fans like to suggest. Just good old fashion bullying. He couldn't do that with Ngannou. Ngannou was too big, too strong and too athletic for Fury to use the bullying tactics that he's grown accustomed to. Ngannou's MMA experience also helped in the clinch in this regard. So for much of the fight, Fury had to go back to his old style of moving backwards and staying on the outside. He was rusty using that style, but those old flaws reared their ugly head as well. Ngannou catching Fury with the left, the punch that Fury has always had problems with while using that style, was no fluke. So I think that Fury looking bad tonight wasn't because he was poorly trained or injured or any of the many excuses that people are coming up with. He looked bad because his opponent took things away from him and forced him to fight another way.