Joe Rogan says Conor McGregor should think twice about fighting Kamaru Usman: “Usman is a big man and he’s top of the food chain.” “Now he’s talking about fighting Kamaru Usman. Be careful what you ask for,” Rogan said Wednesday on his “Joe Rogan Experience” podcast about McGregor (via MMAJunkie). “Be careful what you ask for. Usman is a big man, and he’s top of the food chain right now.”