Max Holloway became the undisputed UFC featherweight champ Saturday night... but Joe Rogan believes Conor McGregor is still the best featherweight in UFC history. "Conor is the greatest 145-pounder of all time cause he knocked out Aldo, who was clearly the greatest." "People will fight against it 'no because Aldo was the champion for so many years.'" "... There's no other metric other than a knockout."