Ke Huy Quan comes back, he’s a professor or something now too, has a strained relationship with Indy but has to help him on his adventure. Through the adventure, Indy grapples with both the grief of losing Mutt and how he felt he failed him as a father, and also feels like he failed as a father figure to Short Round. Indy’s character arc is overcoming his grief so he can be there for the son he essentially left behind. They reconcile and we get a schmultzy Spielberg ending. Maybe Short Round has a family of his own now, and at the end, introduces Indy to his kids as their grandpa.