player improvements

[Cleveland wins]

Why don't players improve sometimes? For example. I have 3 assistants and i'm doing an orlando magic dynasty, i used one assistant who has the defensive specialty with an a+ in defense on neson, i have a shooting coach with a b- in offense and i used him on dwight howard and i have a gaurd coach with an a- in offense and i trained bogans who is 26 in offense and i trained all 3 players 100% for 4 weeks. At the end of the month i get 3 results for nelson, howard but no results for bogans in fact the other result was grant hill improving in blocking! Why didn't bogans imrove? This happend wih younger players as well sometimes i just don't understand. What can i do to ensure that all of the players that i train improve?

[Andrew]

There are hidden attributes (LEARNING and WORKETHIC) that determine how likely a player is to improve from constant training. Players who have low ratings for these attributes are more difficult to build up through training during a season.