ANN ARBOR, Mich. — George Green, the father of Michigan defensive back Gemon Green — who was injured in a Michigan Stadium tunnel incident Saturday night after the Michigan-Michigan State game — said his son is in concussion protocol and has a cut over his right eye. He has retained top lawyer Tom Mars. A police investigation is ongoing after the “egregious” situation — as Michigan coach Jim Harbaugh described it Monday — in the Michigan Stadium tunnel after the rivalry game. Ja’Den McBurrows and Green were injured. A video showed the two Michigan players moving up the tunnel as Michigan State…