He might have been wearing a No. 9 Vikings jersey, but J.J. McCarthy was not the real author behind last Sunday’s thrilling 27-24 victory over the Lions. The real mastermind, according to the 22-year-old quarterback , is his edgy alter ego, Nine, who scored three touchdowns in his NFL return after missing five straight games this season due to a high ankle sprain. “It really kind of started to show up this year, and it came about last year during IR,” said McCarthy, who missed his entire rookie