Hi Joshua.
Go to "Relationship Finder" on the pull-down menu. Enter "Fitzgerald-5688" in one profile and "Normandie-32" in the other. The first time it runs, it will say something like "no relationship found". This happens because the default is to only go back 8 generations. But it will give you the option to rerun going back 30 generations. Press that you you will get the generation-by-generation breakdown. For me, William is right at the 30-generation limit on what Relationship Finder will do. To work around that, you can run it using ancestors from earlier generations, like grandparents.
Often when you are looking back many hundreds of years, there can more than one path that can trace a person's ancestry back to a single person. But the Relationship Finder just takes the first path it finds. Going back 30 generations, a person will have 536,870,912 28th-great-grandfathers if there are no duplicates. Given that there were only about 350,000,000 people on the planet in 1100, the chances of many multiple paths back to the same ancestor is almost a certainty.