The True Master.

[obloquy]

However, he goofed by putting so much in that without the Ring (or even it's powers) he wouldn't be able to survive. And because of that I got to think that in some way the Ring dominates over Sauron, because of the fact that without the Ring he can no longer take a physical form, he will just remain a shadowy menace.

This is from the movie. Sauron had a physical body even without the Ring, and he was perfectly capable of surviving without it. In fact, he very nearly overthrew Middle-earth without it. Thank deus for his machina.