Sure, I guess that Mouri's parents/relatives would fall into the names-mentioned-but-never-appeared category. Since Aoyama loves puns, the Mouri-arty thing would make sense - although, Mouri's first name is apparently named after Kogoro Akechi (the Holmes-like detective written by Ranpo Edogawa), but the first name applies only to Kogoro and not his relatives.
Hmm, you're right, the BO is at least 50 years old and Atsushi, at least, should be around 54 now if he's alive, according to File 423 (the dude who was childhood friends with Atsushi is listed to be 54 years old). Even if the BO is exactly 50 years old, Atsushi would have been four years old when the org was founded. I guess we don't really know the age of Elena, though, hmm - but if the parents 'continued' the research, then someone else must have started the research - unless Elena was a clone of her mother and somehow gained memories of her mother or something, and maybe Ai's a clone of Elena! And the 'Miyano Shiho' who went to the Mermaid Island was actually Elena/Elena's mother! Hence why 'Miyano Shiho' went to the island famous for granting immortality, despite Ai not being the type to persue immortality! Also why Ai falls on the cautious side, since Anokata (who might be related to Ai) was characterized as 'overly cautious'! And Chris Vineyard is actually Sharon Vineyard's clone, who also gained Sharon's memories somehow! And maybe that's why Sharon/Chris is so young, despite Gin mentioning that Shinichi was the first human guinea pig for APTX4869! /word vomits own crack theory
*Coughs* Anyway . . .
I searched around for a confirmation of the second 'interview', and though I couldn't find primary source evidence for it, everybody talked about the line as if it was fact so I'm fairly certain that it's accurate. Anyone want to guess at the real name of the BO? Apparently it's tied to Anokata's name.