Maybe this is where Carlo and Connie's kid comeback. It would be a great story to see him avenge his fathers death by takin over the whole family business. And I believe there is an orange by Michael when he dies. Maybe you could have it be the Godson who poisons the orange killing Michael just like Vito killed the man who killed his father at an old age. I know people dont like new characters but he really wouldnt be new. Hed finally just come out of hiding.