I think you could also throw Alonzo Mourning and Grant Hill in there.
Both should have top players in their generations and ended up missing so many seasons. They made comebacks (especially Hill) but they weren't even close to what they used to be. It would be like Mcgrady having a few decent seasons in a row now. Just nowhere close to the player you used to be
Grant Hill hasn't fallen from grace because he's about as graceful an NBA player as we will ever see! He was a star and injuries robbed him of that, but he's carved out an extremely respectable second career for himself as a sup-efficient role player. Every team - EVERY team - in the league would love to have Grant Hill play for them.
A "fall from grace" implies a smearing of reputation. Guys don't fall from grace because they were injured. What about a guy like Chris Anderson, who went from being an absolute fan favorite (albeit as a role player) to being banished from the league for two years, for abuse of undisclosed "hard" drugs (meth? heroin? Oxy?). THAT's a fall from grace.
I'd throw Antoine in there, too. Dude had all the talent to become the Evolutionary Larry Bird. He could score, he could rebound, he was a brilliant passer, he had the stones to play well in big games, he desperately wanted to be a leader... and his own weaknesses caught up with him. Certainly the gambling took its toll, and while it's not clear if he ever "officially" had a problem with the bottle it seems clear that he liked his drink. Didn't keep himself in shape. Bad habits developed on the floor, partially shaped by inadequate coaching (IMO, O'bie let him get away with far too much).
Bouncing around the league, then started bouncing checks to casinos. Thought he was Jordan, but just couldn't keep up. Blowing through millions and millions of dollars.
And he ends up like this...

... desperate for one last chance to get back in the NBA.
I mean, if you were writing a movie about a tragic NBA figure, wouldn't you think about using Antoine as your framework?