Misc questions about Cygnus and Karma Scissors

Whoah, BL is shared? Can someone explain exactly how this works?

So if I make a Cygnus that connects to my main, how will my friends know that it's MY Cygnus? What about my friends' BL slots; will my main character and my Cygnus only take up one BL slot?

The buddy list being shared was a glitch in KMS, they eventually wiped everyone's buddy lists on Cygnus to clean it up.