EAST LANSING, Mich. (AP) — Later this week, the mystery surrounding Michigan State’s offense will finally end. Until then, the Spartans aren’t revealing much. “Friday night, after the game, we’ll be able to brag about it a little bit,” quarterback Brian Lewerke said. “But as for now, we can’t really do too much.” Whether the priority is secrecy or modesty, Michigan State has said little about…