Jag tycker det finns en del som talar mot Helkar-teorin.
Mordor skapades i de första krigen mellan Valar och Melkor.
I en not till "Cirdan" i Home XII, kan man läsa:
Citera:
Maybe already an Elvish name for that
region, because of its volcano Orodruin and its eruptions - which
were not made by Sauron but were a relic of the devastating
works of Melkor in the long First Age
Jfr, Valaquenta
Citera:
Thus began the first battle of the Valar with Melkor for the dominion of Arda; and of those tumults the Elves know but little. For what has here been declared is come from the Valar themselves, with whom the Eldalië spoke in the land of Valinor, and by whom they were instructed; but little would the Valar ever tell of the wars before the coming of the Elves. Yet it is told among the Eldar that the Valar endeavoured ever, in despite of Melkor, to rule the Earth and to prepare it for the coming of the Firstborn; and they built lands and Melkor destroyed them; valleys they delved and Melkor raised them up; mountains they carved and Melkor threw them down; seas they hollowed and Melkor spilled them; and naught might have peace or come to lasting growth, for as surely as the Valar began a labour so would Melkor undo it or corrupt it. And yet their labour was not all in vain; and though nowhere and in no work was their will and purpose wholly fulfilled, and all things were in hue and shape other than the Valar had at first intended, slowly nonetheless the Earth was fashioned and made firm. And thus was the habitation of the Children of Ilúvatar established at the last in the Deeps of Time and amidst the innumerable stars.