Well...haven't you figured it out by now?
I'm woefully uncultured, therefore I have no damn clue...
I honestly haven't read much, if any, classical literature like Jekyll and Hyde, but i get the feeling they made a mistake early on in their thinking and his site actually WAS Sherlock Holmes all along.
Happy Public Domain Day!
@Hydra: Holmes is a Gary-Stu, he wouldn't have made the mistake of not naming their Sire
@Merrsharr: I'm a little unsure what you mean by Gary-Stu.
@Hydra: http://tvtropes.org/pmwiki/pmwiki.php/Main/MartyStu (Also referred to as "Gary Stu")