Something about Victor must have been remarkable enough to genuinely spark Holmes' interest, but from the story itself we cannot tell what it is. So there's enough room for a fanfic to explore it. :)
True! And I really enjoyed your take on it. Also, I do think that Victor as you've written him is a 'good' man; perhaps not in his own eyes by the lofty standards he described, but we the readers can see it in him. Another layer of meaning to the relevance of goodness. :)