Actors don't create stories, it's not their job; that's for writers. Actors create believable characters.
I never saw General Patton; consequently I have to take your word for whether or not George C. Scott did such a marvelous job as Patton; however, I have seen Ray Charles more times than I can count, and there were times when I thought I was looking at "Ray Charles"; Jamie Foxx had all those quirky mannerisms of Ray down pat.
Have you ever seen "The Godfather"? The answer is no, because he was a fictional character, but all of us have seen Ray Charles; therefore we all know how he looked, as well as his mannerisms. I rest my case.
Enjoy the music.