You're mistaken. You get less regular xp (500 vs 1k vs more, with more opposition), but with all the other retrievals, from all of them, you get edge points. The only one you don't get edge points from (and that additional regular xp) is from Tremblefist. It makes no sense. It's retrieval. You can argue all day about how strong or not or how hard or not, but a retrieval is a retrieval. They should all be treated the same.