Actually you can look at it this way: the "normal" training needed to keep people at their level is given to the whole roster. What we "see" as training is extra-courses with a specialized coach who focuses on special aspects of the game. His time again is precious, so he´s only willing to give players extra courses based on how much they played last week in certain position, as he uses video analysis and stuff to go through their mistakes, tries to analyze them with the players and work out a way to erase them.
Zwei Dinge sind unendlich, die Dummheit und das All...