The Question and Answer section for The Five People You Meet in Heaven is a great resource to ask questions, find answers, and discuss the novel.
I always felt that the five people Eddie met represented unfinished bussiness in his life. I suppose you might consider Mickey Shea. You can check out his backstory at the link below:
Marguerite tells Eddie that she has already met her five people in Heaven and now understands how much Eddie loved her.
War left Eddie with lifelong burdens, both physically and emotionally, while Joe went on to have a successful sales career. He made a lot more money than Eddie did.