They say the closing of one window leads to another opening, and that could certainly be the case with one of Rangers’ budding young talents. How many times over the years has a player been fast-tracked out of the academy due to an injury suffered by a more senior player? Perhaps the most famous example can be found at Manchester United. A little-known teenager by the name of Marcus Rashford exploding onto the scene with a fantastical debut brace after Anthony Martial was ruled out in the warm-up during a 2016 Europa League dismantling of FC Midtjylland. Now, obviously that was a one-in-a-mill…