Yeah, that would do it.
Now in a perfect world, you should be able to watch three great movies back to back. The first two are some of the greatest movies of all time. But I think Godfather 3 in and of itself is a good movie. The problem with the movie is that you don't quite have the amount of great characters from the last two. Duvall's absence the most notable. I think if he was in it, it could have made up for Coppola's bad performance at least. If Ryder was in it and you had Duvall, I think the movie wouldn't have been as disparaged. It still wouldn't have been as good as the other two, but I think those are two big dings against it. The story itself is great though. To me, that's the story of a third one if you have to do it.
The script with Tom Hagan exists online. It's pretty much the same story but with Hagan factoring in it. And it makes a difference.