Why question marks hang over McGregor's UFC return - Published When Conor McGregor steps into the octagon to face Max Holloway after a five-year absence on Sunday, it will be a bittersweet moment for many fans. On one hand it is the return of the biggest star in mixed martial arts history, with McGregor central to the sport's rise in popularity. The Irishman was the UFC's first simultaneous two-we...