Yeah he definitely wanted others to do the PT initially (approached people like Kasdan and Ron Howard), which was kinda in line with how he wanted the SW franchise to be from the beginning. The problem was that the people he met with would just tell him that he should do it, which is a totally understandable response considering he would essentially still be the mastermind behind the films and at that point his writer/director track record was pretty fantastic.
Big picture wise it’s hard to argue that he’s basically some sort of genius. So yeah on some levels he’s a great writer, because he has amazing ideas for worlds, characters, story, themes, etc., it’s something he understands really well. And on some level he’s a great director too, because he knows what he wants and he’s great at communicating and working with the various departments to create this incredible world and build fantastic sequences. But his talent definitely breaks down on some level, and the human element is the best I can do to pinpoint it.