Of course, it's no use the details within each league being correct if leagues are missing feeders, or even shouldn't be shown in the Pyramid! That's why I've been emailing every single league at level 10 or below to verify that I'm showing in the right place, and that they don't have any feeders I don't know about. So far I've got back replies from about half, and generally my information have been correct. The most common change has been the addition of new feeder leagues that simply didn't exist last time I did this exercise.
Enjoy your newly verified Pyramid!