Regarding the Enemy

[Raynor]

Sauron was 'greater' effectively, in the Second Age than Morgoth at the end of the First.

I would notice the use of the quote marks in that phrase. Moreover, Sauron is "far smaller by natural stature" and has "(much more limited) power ". He was never capable of destroying the whole of Arda (as the valar knew Melkor could, if they would have attacked any sooner - according to your own source).