This is quite a brain teaser! I want to go through all the Pandion events to be absolutely certain, but I think that I may be able to solve this problem by making the parentage of Pandion_2 uncertain, and editing their descriptions a bit. I'll update this post as I work on it. I think this reflects what Pausianas is actually saying "there was a Pausanias who was an eponymous hero, but I'm not sure whose son he was."

"The one who was the eponymous hero" is actually an important enough character trait to be unambiguously identified, and so it is worth messing a little bit with the existing Pandions in order to make sure this works.

Update: having looked at this more, I think that Apollodorus' Pandions and Pausanias' Pandions are hopelessly confused. I'm not sure how best to fix this, and am going to put in on the back burner for a while, since I don't think we've confronted exactly this problem before. I think the solution is to decide which aspect of each character is central, and number the characters that way. Then, when authors disagree about events, we'll just create separate bibles with each separate characters. This will create a lot of overlap, but I think it will capture everything most accurately.