A pizza delivery man from Lawrence is Vegas-bound on the dime of top-ranked UFC light heavyweight Daniel Cormier — his favorite fighter — after Cormier got word the local mixed martial arts fanatic missed out on a chance to attend his bid for a world title in September.Russ Roman, 29, said he’d just purchased an airline ticket to Sin City for a December Ultimate Fighting Championship event when news broke that Cormier had been tapped as a late replacement for an injured fighter and would challenge Jon Jones, the UFC’s top dog, on Sept.