Michigan junior cornerback Will Johnson notched a pick six for the second time in four games, and both of them were huge. Saturday’s, a 42-yarder in the third quarter of a 27-24 win over USC that changed the momentum of the game, might have been the difference, head coach Sherrone Moore said in his postgame press conference. RELATED: Michigan edges out USC in Big Ten opening thriller But Johnson went to the locker room in the fourth quarter for X-rays after an apparent upper body injury. It looked bleak when it appeared his family made its way up the tunnel to join him. Johnson, though, return…