Sven,
You have 28 days to get 5 levels. 1 level is 15 points. So thats 75 points in a season? Just from regular training and games you are bound to get about 45. So you need extra 30 in a season to level him properly. That is like 30 greens or 1 green a day for a fast trainer? Sure some for extra injuries. But thousands? Where am I wrong?