CS4/Anguis/Enforcers: Yeah, First, Fourth, and Fifth are still the mystery Anguis. We know the Fourth talks like Lechter in terms of speech pattern, but given the Fourth was also part of Sharon's assassin organization that all but rules out it actually being Lechter. The Fifth Anguis has long been speculated to be someone with knowledge of the Gralsritter's activity and talks in a manner consistent with an older man. Barkhorn was a popular suspect before CS3. I don't know what to make of Epstein yet, but someone (I think Mac?) mentioned that timewise it lines up with McBurn pretty well though.
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xp1337: Don't you wish there was a spell-checker that told you when you a word out?