@darius Ooh yeah that makes sense. In CS2 Sharon says something like "your number doesn't have anything to do with your combat prowess, but in McBurn's case he's No. 1 and actually does happen to be the strongest," which I was thinking implies that she knows who everyone is—but she's presumably only talking about Enforcers, not Anguis.
Really any kind of amiable traveling fellow who says hey to the protagonists every so often should immediately raise their suspicions, haha
@danbruno yeah I think all the enforcers are known to each other (even if it's not their full identity, a la Bleublanc)