Maya and Calanthe are interesting authors to talk about, I think, because while their work is "no longer available on the internet" it's among the most sought-after in my experience. I get requests on tumblr to share works by both authors with some regularity, and while I don't share it, (a) I do have it and went out of my way to find/save it; (b) I think it's telling that there's such tenacious demand for it. And telling, even, that they came up so readily as for-instances.

Does it matter and if so, why? I think yes, but not because they would have made much of a difference in the results. Rather, it's because they probably make a difference in readers' perceptions of fandom - because they're classics, because they're in demand, because they're held up as some not-quite-platonic-ideal of what H/D fic was before canon was closed. And, when those readers become writers, it may also have an effect on how they write the dynamic or how they think the dynamic *should* be written.

So perhaps another metric is relevant: not just the number of authors or number of fics, but the number of views. In terms of our perception of what is/was going on in fandom, and what is/was in demand in fandom, how much of it really is influenced by a few classics? How significant is it to talk about how many top!Harry fics there are, vs how many times top!Harry fics were read?

(In the broader category of "thoughts on this," older fic reads differently to me in so many ways that topping/bottoming is kind of the least of it. But that's a whole other story.)