He/She is correct but the situation with
the One ring is different. No one can control
the Ring because it was made by
Sauron himself. But someone can
overthow Sauron. Sauron can be destroyed though he is a
Maia. No mortal, no
elf can rule the One Ring but they can use it! But the Ring will not 'listen' his owner bacause that owner will not be his master. The Ring has only one master - Sauron. But if someone defeat Sauron he will be the
Dark lord. Not Dark lord because Sauron will be alive while the Ring is still undestroyed.
The one who would overthrow Sauron will be a toy in the hands of Sauron - The One Ring. He can use it but he cannot command it.