the thing is i want to develop my team, so i want to train as fast as possible, i dont want to loose training time by something i dont know about.
also i thought the potential is working together with the salary so changing the train wont help much (i do it anyway since the beginning coz multiskillers) coz he maybe reached the limit. also i dont know how much is this penalty, the same as the height and the age and the trainer-differences... some hints could be useful, coz i think its a very complex formula.