First of all sorry if i have any misspellings or something is wrong i'm not an english native speaker.
I've discovered this like two weeks ago and i don't know if someone has reported this bug yet. I've found 2 problems with the AI and the player creator/editor.
When editing a rookie: I like to create myself and friends in the game and see how the carrers go and i discovered that the AI dosen't seem to take in mind the changes you make. If you edit a second round guy and max out his atribbutes he will be pick in first round first place 99% of the times but when the season starts they get relegated to D-League or they get no playing time, it's like if the AI still sees them like second round guys.
Creating a player: They dont apear in the FA and dont get any contract offers, no matter the cap space, the potential, age... I've tried it whit 20 players and only 1 got a contract (was a 4/5) and was in the second season.