Eh, sorry, I actually thought that my post was on topic, but reading through the thread I can see that it wasn't
I thought it was a discussion about what BoG actually hit and I brought my own experience forward (I tried it when I was a lightie sorc with tribunal paladins under me).
I agree that all undeads should be dark auraed, but I do however think that BoG should still hit those who have polymorphed into deep-elves for two reasons. To limit twinkage, despite the obvious stupidity on the paladins side they can completely void a paladin spamming c bolt delf. Secondly, because partly the spell makes the evil soul of the target suffer, but also the deep-elves light resistance plays a part.