I'm pretty sure there is no difference between your own draftee and bought player in terms of training. There are several reasons that might lead you in that kind of theory and most of those reasons have been stated above, so just wanted to confirm that. Also, two weeks before my bought trainee got 3 skillups while my draftee got none:) well, there were the reasons for that, but its not about who is your own draftee and who is not