I dunno...I'm just used to the show keeping their unsubs as human as possible, so to see the whole "real name" thing just sort of shrugged off at the end was more jarring for me than anything. But maybe that was the point: the birth name is a factor of identity, and the unsub had such a spliced identity that he didn't have a real name.
I was probably just expecting something different as the last line of the episode.