By Tzvi Machlin In the fallout of the investigation into 2021 Kentucky Derby winner Medina Spirit testing positive for a banned substance, the horse was formally disqualified – which means there is a new winner. On Monday, Mandaloun, who crossed the wire second in the fateful race, was named the new winner of the 2021 Kentucky Derby. Mandaloun finished half a length behind Medina Spirit. Mandaloun’s DQ victory in the Kentucky Derby will also be the first official win at the Kentucky Derby for jockey Florent Geroux and trainer Brad H. Cox. Ironically, Mandaloun also won the prestigious Haskell …