I'd give some credence to the stretching theory if stretching could have prevented Gamel from tearing ligaments after running into a wall, Ramirez from twice sliding awkwardly into second base, Weeks getting hit by a pitch, or Segura getting taken out on a double play. Maybe Braun could stretch more. He seems to have random muscle strains pop up, but stretching wouldn't have prevented anything for almost every major injury the Brewers have had the last few years.