Morgoth is Tolkien's version of Satan, you know. He has all the time in
the world, and he's been plotting since time began.
And as for the master device, didn't you get my heavy hint? I was talking
about the
Ring.
“I dislike Allegory - the conscious and intentional allegory - yet any attempt to explain the purport of myth or fairytale must use allegorical language. (And, of course, the more 'life' a story has the more readily will it be susceptible of allegorical interpretations: while the better a deliberate allegory is made the more nearly will it be acceptable just as a story.)” (From Tolkien Letter # 131.)