I wouldn't call Maresca an attacking midfielder. An attacking midfielder plays somewhere between attack and midfield, like Ronaldinho, Deco and van der Vaart. Maresca is a two way midfielder, his defensive abilities are just not as good as his attcking ones. But he plays on the midfield. It would be the same as saying that Pirlo is an attacking midfielder. He ca pass and dribble really well, but he plays defensive midfielder.
So I think that Maresca and Emerson would actually make a very good duo. They can both attack and defend, while Emerson is better defending Maresca is better going forward.