4. John Kavanagh
Kavanagh is one of the most high-profile MMA trainers on the planet because he coaches Conor McGregor, who is the biggest star in mixed martial arts history. However, he attracted criticism in recent years because of his pupil’s downward spiral. Former UFC champion Michael Bisping even called for McGregor to fire his long-serving coach.
That’s because critics see Kavanagh as a ‘yes man’ who doesn’t stand up to McGregor. McGregor’s wrestling hasn’t improved over the past few years. Meanwhile, he changed from a karate stance to a more conventional boxing style. This saw a decline in results (via Insider). The icing on the cake may have been when Kavanagh claimed McGregor had Dustin Poirier right where they wanted him early in their trilogy fight in July 2021 when in reality, McGregor was getting dominated with ground and pound on the mat.