ANN ARBOR — Michigan is Frozen Four bound — again — and head coach Brandon Naurato has a good feeling heading into a Thurs., April 11 game with Boston College. The Wolverines are playing with great confidence and have rallied around each other, an extremely tight-knit group after wins over North Dakota and Michigan State in the regional. They got an added boost early this week when they learned defenseman Seamus Casey would return after missing most of the Michigan State game with an undisclosed injury. “One hundred percent,” Naurato said when asked if Casey would be good to go for the Frozen …