Originally Posted by dje31
I suppose it's possible that the shared holes quiet down some of the string ping / buzz that dampers and rubber bands eliminate. Four of the eight shared holes involve the bottom two crosses.
I think it's plausible too. A lot of string dampeners just dampen 2 mains and a single cross. So if making 2-3 strings vibrate against a small piece of rubber works, then making more strings (8?) vibrate against other strings might work too.