I suggest that the statistics pages include setting where you can view statistics for only the descendants of a certain person or people or alternately to exclude the descendants of a person or people. For example my tree records anyone who shares an ancestry with either myself or my wife. A parameter could be built into the settings so that when you go in it displays the male heads of each branch. To qualify as a branch head the person has to be a male who does not have any recorded parents or parents in law. You then have the option to exclude any branch or any multiple branches from the stats and then submit to get revised stats.