"He probably didn't know there was another when he changed his name. They probably know him Down There as Crawly yet." Two. It might seem unlikely, but it also seemed undeniable. Which led to the question of whether there might be more than one of all of them. The thought of another Arizaphle made the angel cringe. Just as this Castiel was doing now. There was something about him...something that wasn't quite right, but Aziraphale couldn't quite pinpoint what that something was. He was just...off, somehow.
The introductions did do one thing; they got them off the subject of Crowley, for which the angel was relieved. He decided the best course of action was to continue away from talk of his demon pal and back to more important things. Like why he was here.
"I'm a Principality. What class are you?" It wasn't always easy to tell, particularly when they could do things like hide their wings in public. "I take it you have not heard from the Metatron, either?" Being left in the dark was all rather unnerving to Aziraphale. Bugger that Crowley. Why did he have to show up? Maybe if he'd been left alone in his bookstore, it all would have been alright. He knew the thought was false, but it was nice to blame someone.