Ok anyone read Bobs books?  I have a question about disk members who are they? 

Let me use AA as an example.   He/she lived many lives, one of which was Bob Monroe? 

Is Bobs Disk all the other separate lives that AA split itself into and lived then found their ways back? 
For example lets say when he was a Roman Soldier and he eventually made his way back past the rings to the disk?

Or are the disk members other personalities not AA's separate lives but other beings?

Also the term graduating is used a lot by Bob and Bruce.  Such as a being on his or her last life is seen as a light travelling through past the rings and then it winks out. 

What happens when the graduating being graduates and disappears?  Does it go to the disk
or does it refer to graduating from the disk and  disappears?