@Andrew - Re duplicates list - Agreed. I'll think about it. The duplication is interesting. Although having, say, 16 different lines of descent from Robert the Bruce back 20 generations is perhaps less significant when one considers that, going back that far, you have millions of different lines of descent.
Re sources - That would be tougher and would require retrieving and evaluating the profile text (which the app doesn't currently do). (I note that WikiTree Statistics evaluates sourcing based on a manual review of a random sampling, not any kind of automated review.) In theory, doable, but I'm not sure I could figure out how to make the app do it fast enough. That might be out-of-scope for this app.