Oh ha, yes, I think I vaguely remember the epigraphs. :-)
In this case, I think it really was more about process of elimination; there weren't all that many people who might have written a BBC fic, and you were one of the few people who *definitely* wrote a BBC fic! And I've been out of the guessing game long enough that I don't remember specifics of most people's style, so I was flying blind. If anything, I think the one feature I grabbed onto might be the use of section breaks that were just a couple of blank spaces, rather than punctuation.
Re: Part 3
In this case, I think it really was more about process of elimination; there weren't all that many people who might have written a BBC fic, and you were one of the few people who *definitely* wrote a BBC fic! And I've been out of the guessing game long enough that I don't remember specifics of most people's style, so I was flying blind. If anything, I think the one feature I grabbed onto might be the use of section breaks that were just a couple of blank spaces, rather than punctuation.