If Rangers player trading model is to be fully effective, Philippe Clement has to start seeing more club trained players making the step up to the first team. The manager regularly has players from the academy in the squad, but only Ross McCausland has made any sort of real impact. With Zeb Jacobs rumoured to be leaving Auchenhowie in his role as Rangers academy director, there is one problem that Philippe Clement will want fixed by whoever replaces him. READ MORE: 7 best Rangers loan signings of all-timeRangers failing Philippe Clement with B team shamblesAt the end of last season, despite be…