Confusing Fact about the Races/Spoken

[MistakeNot]

I'm more inclined to believe the sahagin ARE the "sharks" as in anthropomorphic fish creations, since we hear in Elpis some ancients discussing how some other ancient created the Lupin, implying that the beast races are ancient creations rather than sundered

Very possible. We know that one of the beast races - the Ixal - were created later as a result of Allagan genetic engineering.