Two Dark Lords?

[Eönwë]

Originally Posted by Nogrod

But the results would have been just adding a new tyrant to the throne.

In the same way that Gandalf says in the Two Towers to Aragorn, Legolas and Gimli:

Indeed I am Saruman, one might almost say, Saruman as he should have been

And I think it would be the same but the opposite in the case of Sauron. Whoever mastered the ring would just fill in the place of "Dark Lord", no matter who they were (other than Tom Bombadil).

Originally Posted by Inziladun

I believe Isildur was greater in all ways than Boromir: as a captain, a warrior, and in strength of will.

I would say that Boromir and Faramir are sort of like the two halves of Isildur in a way.