They could've had him somehow survive
being thrown out the window all this time, just to troll the fans and throw all the presupposed continuity completely out of whack.
Then they could retcon everything by saying anything convenient that happened in the original trilogy was because of the magic black man behind the scenes, and that's why you didn't see his ghost in Return of the Jedi!!!
Big reveal is that he's hanging out with Luke in his cave and is the reason why they're both so cranky, but decide to fight again when elf girl shows up for training she doesn't need
Because it's an idea that could be funny and/or interesting, of course they'd never do it.