They keep track of "assists" in basketball.
Has something to do with "chain of causality".
Please, please don't make "Natural Selection" even more mysterious and metaphysical in nature than it already is. Demoting it from Godhead to godhead really doesn't avoid the problem you know.
So, OK, "Natural Selection" does nothing but "assist".
It needn't even do that. It may sometimes do so. But there's no necessary role whatever, that I know of or can imagine, for natural selection in speciation.
The example I gave was a case where two subspecies where in contact, and there was reduced fertility between them, so that it would be advantages for individuals to recognize, in some fashion, whether or not a potential mate was a member of their subspecies.
But speciation might also occur because two populations are separated by some physical/geographic barrier and "drift" apart genetically during this time. There's no way natural selection can be operative in this case, when the populations are not in contact.
So, again, why do you think there is, or should be, some relationship between NS and speciation that requires demonstration?