The WT maintains that perfection was lost when Adam and Eve sinned. Neanderthals were a people of the same "Kind" or species in the biblical sense, as is evident from our all carrying some Neanderthal DNA.
As the neanderthals came before Adam and Eve, they must have been perfect, and yet their remains show some horrendous signs of disease.
I wonder how the WT could possibly explain all this ?
And where does it leave their doctrines of Sin and Univesal Sovreignty etc ?