I don't understand if you are asking a question or just trying to let everyone know that there have been 3 types of mechanisms for the 2x2x2.
1. Yes, the current larger 2x2x2 puzzles (Pocket Cube, Pyramorphinx, puzzle Heads) have an internal mechanism which does not contain a Ball at the center of the object.
2. The smaller version like the keychain version of the Pyramorphinx, has the ball mechanism.
3. And of course the original Magnetic version too.
My site has been recentely updated to show the internal mechanisms of the Skewb, 4x4x4 and 3x3x3 and as I get more prepared, I will add more to the site...including the various 2x2x2 mechanisms and 5x5x5 if I can figure out a safe way to get it apart and back together without breaking the corners http://www.virtualpuzzlemuseum.com/4x4x4puzzles2of3.htm