I bet it's the MATRIX. The topsheet on the Blend and the Prophet is not flat. If you've handled them, you know that the carbon and metal matrices are smaller than the dimensions of the ski, and that causes a raised section on the top of the ski with an irregular shape. A cap makes sense for these models because it will press the topsheets over the whole shape of the ski and aroudn the sides. The way sidewalls are built, it would be really hard to have a bubbled out topsheet. Someone check if the new Prophets are caps too, if so, that proves my theory.