I think the films have to create composite characters. Otherwise the script is limited to the true life details of who did what.
AA was much more believable as a "sophisticated" gangster than he was playing Gotti. In fact, I think the part in AG was tailor made (pun) for him.
I've read accounts ( by Bumpy Johnson's widow and from contemporary Nicky Barnes) that claim that elements of the story of FL were made up.
Can anyone shed light on what Lucas' involvement with the mafia( if any) were?